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"You wanna see my pencil?"
— Jeffy showing Mario his pencil, also his first line in the series.
"Hey, Daddy! What doing?"
— Jeffy greeting Marvin/Mario everyday.
"My name is Jeffy. See, it says it on my shirt, Je-ffy."
— Jeffy introducing himself to Marvin for the first time.
"Why you do that?"
— Jeffy sometimes when someone explains something to him.

Jeffy is one of the main characters of the SML series who is the adoptive son of Marvin and Rose.

He is the twin son of Nancy and Jacques Pierre François, and the older twin brother of Feebee, but since his biological father Jacques faked his death and after he injured Nancy by shooting her in the head in "Jeffy's 18th Birthday!", he is now the adoptive child of Marvin and his wife, Rose.[8][9] Despite this, he still has his clone, Scooter, who is currently wandering around outside of Marvin's house somewhere.

The things he does in his everyday life is annoying and torturing Marvin, hanging out with Junior and his friends, causing trouble, hating school, making messes, throwing plates full of green beans, eating chocolate cake, and much, much more.


Jeffy was born on August 21, 2004 in a port-a-potty, and grew up in the deprived environment of 7 Jeffy Street in the suburbs with his mom. He never attended school due to his mom's irresponsibility and his father forgetting about him, causing him to become dumb. He also lost his toes through an unknown incident. This was seen in "Jeffy Breaks His Leg!".

Jeffy has been raised in poverty due to his father abandoning Jeffy alongside his mom and sister.

Jeffy has gone to different places with his mom before abandonment.

Feebee was his twin sister, who was later killed in a bike accident in 2015 as Nancy took her helmet to use as an ashtray. Her death was the reason why Jeffy always wears his helmet wherever he goes. He also wears his helmet to hit himself with a hammer.

After Nancy had enough of his antics, Jeffy was dropped off at Mario and Bowser's apartment lot. Jeffy lived with Mario and his family in the apartment (Causing havoc around the house, especially towards Mario), although the latter hated him before being evicted from the apartment and having to relocate to the new house.

After his wealthy father faked committing suicide and willed his money to Jeffy, Nancy returned to reclaim Jeffy in order to receive Jacques' money when Jeffy turns 18, but was arrested and incarcerated for child abuse, prostitution, and several other crimes. After Nancy's arrest, Mario chose to officially adopt Jeffy as his son and the two now begin to bond every day.

As of today, he is still Mario’s now adopted son and spends his days misbehaving and torturing the latter, playing with Junior and his friends and continuing to cause havoc and destruction.

He also drives a 2007 Chrysler PT Cruiser convertible, in which he calls the "PP Cruiser" or the "Jeffy Hoe Wagon 2.0".

He formerly had a 2020 Chevrolet Corvette C8 and a 2001 Buick LeSabre aka Jeffy's spray-painted car.

Ever since during 2020, Jeffy has begun to suddenly become smart and helpful on rare occasions such as the time when he became a detective to help Mario getting out of jail and the time when he watch a scary movie with Mario, and Mario keep lying about the strawman movie while Jeffy proves he is lying. But despite this, Jeffy still loves his family.

He is also shown to be heartless, as shown in "Jeffy the Doughnut King!", where Brooklyn T. Guy told him that his boss was dying because he hadn't eaten a donut, but he didn't care, and he just replied by saying he was bored.


Jeffy is somewhat different than the average young adult, with a tall and slim posture. He wears a blue bicycle helmet (with dark brown, messy hair under it), usually has a pencil shoved up his nose, has blue crossed eyes, and wears with a yellow T-shirt that reads "jeffy" on it which his mother wrote so he would not forget his name. Apparently, when a different word is written on it, he thinks his name is that word as seen in Jeffy's Shirt! when Junior wrote “poopy butt” on it. Jeffy thought it was his actual name to the point of losing 100,000,000 dollars because of it.

He wears short dark blue jeans with a Pamper diaper (which, according to Jeffy himself, is on the outside so it doesn't get dirty), which he occasionally spanks. He wears black Adidas sneakers with black shoelaces. His biological appearance seems to be mixed between his parents, with his blue eyes inherited from his mother and his dark black hair inherited from his father. His face is oval shaped with two teeth and around the nose, along with two eyelashes and a unibrow. Jeffy's jaw has a minor damage due to it making retarded faces.


Jeffy started off as a mentally disabled stereotype, before changing into a stupid and misbehaved person who swears like a sailor, explodes in anger at any slight against him, and knows a lot about perverted acts for someone his age. Over time, he has matured and does not annoy Marvin and Rose (Formerly Mario and Rosalina) as much as he used to. He barely swears anymore and only acts more like a troublesome child. He is also known to be very strong, possibly one of the strongest characters in SML, as he tends to beat up bullies, hit balls really hard, and has a high pain tolerance. Overall, Jeffy's personality has gone through more changes than any other character in SML.

He has a habit of spanking his diaper placed outside of his pants as well as soiling his pants often. When he is called a "bad boy" or in some cases a "r****d", he tends to have a breakdown by throwing his head and hitting it onto any surface but calms down when he is called a "good boy" (this is no longer the case after the events of Jeffy Loses His Pencil!). However, his breakdowns can become extreme and violent, which involves curse words and being rude towards Mario and Rosalina. He also flips his desk in "First Day Of School!" because the teacher (Who is Jackie Chu) assigned a 10-page essay that was due the next day and cusses (mostly the F-word) at Jackie Chu, saying "ARE YOU F***ING HIGH?!" He often says "Why?" whenever someone tells him what to do or what not to do. He even keeps saying it whenever someone answers him. He also has a habit of calling things he likes "pee-pee." He also often says "I don't even know" when asked questions.

He likes to put his "pee-pee" in various objects, especially Cheerios boxes, to the point where he somehow even impregnates one and develops romantic feelings for it.

He deeply resents Bully Bill, who picks on him and subsequently beats up all the time, but the person he hates even more is his teacher, Jackie Chu.

He is also afraid of trivial and ridiculous things, such as animals, toilets, snow, ostriches, and the number 7. Based on characteristics, it is suggested that he has mental disability. His mother delivered him to Mario because she did not love him for unknown reasons (according to Jeffy). He also has a fear of water. This is shown in Jeffy's Bathtime!, when he refused to take a bath. It is also shown in Jeffy's Swimming Lessons!, when he refused to take the swimming lessons and would scream when in water. Because he has a huge fear of water he would drown almost immediately. This is shown in Jeffy's Swimming Pool!, when he drowned in the pool due to his difficulties of swimming.

Despite not being that intelligent, Jeffy has shown traits of intelligence, but in a stupid way at times, such as in Jeffy's Homework! when he reasoned that the equation 8-4=8, since they are taking 4 out of the equation, even going on a profanity-laced rant as well as getting very smart over the years as Mario thinks he will not notice anything or remember anything but he does so he is not very dumb anymore. He is also an extremely skilled painter, a trait passed down from his father. He has also shown signs of intelligence as in Jeffy Gets Ran Over!, where he remembers everything that happened to him after getting knocked out by Mario's car, as well as knowing that Mario is the one that hit him.

Jeffy has shown to be demanding, even more than the level Junior displays, as seen in Jeffy's Bedtime!, where he demands that Mario and Rosalina make his green eggs and ham, "Jeffy Gets Potty Trained!" when he demands that Rosalina give him marshmallows instead of peas, "The Hitman!", where he wanted Jello after Mario gave him green beans, he refused to eat his McDonald's Chicken Nuggets because he wasn't given 20 toys and threw them away, in "Locked Out", where he demanded chocolate cake, cried when Mario didn't give him it and locked Mario out to enjoy the cake, especially in front of Mario, and in "Jeffy Gets Help!", when Jeffy yells, screams, and throws a temper tantrum because Mario said that he would not watch SpongeBob SquarePants.

Jeffy is shown to enjoy playing pranks, as seen in "Jeffy's Cellphone!", where he prank calls several places, including an employee named Josh and a prostitute, resulting Rosalina thinking Mario is cheating and beating on Mario, and in "Shrek The Babysitter!", where he locks Shrek in the bathroom with the help of Bowser Junior. Both of these videos shows that he seems to be less unintelligent, causing many fans to think that this could be a normal version of Jeffy, despite all of his intelligent moments in the series. Some people [who?] think Jeffy pretends to be mentally disabled. When his real mother Nancy tried to claim him back, Jeffy begged Mario to let him stay and promised to be a good boy (and kept his promise by not playing the cat piano when he went back inside), indicating that he loves Mario very much. Jeffy's obsession with swearing may be from his mother and the way she acted in front of him and treated him.

Despite of all this, he is generally more on the friendly side and the bad things he does is mostly due to his unintelligence. He has his fair share of good deeds that outweigh the bad ones, such as being considerate to Hansel in three episodes. He is most likely misunderstood after suffering pain from his biological mother and witnessing his twin sister's death, which might explain his outburst problems.

Although he is unintelligent, he was shown to be an adult to Mario in some episodes such as the time when he caught Mario spilling water all over his bed and Mario wanting to play with his Lego rather than eating his food. And sometimes he does not like to believe people like in The Halloween Heist!.

Throughout his time in the series, his intelligence has steadily increased; as of 2022, he is of average intellect, able to come up with clever plans (such as in Jeffy and Junior's Big Heist!) and successfully escaping from his mother in Jeffy's 18th Birthday!.

Personality Traits[]

  • Friendly
  • Hot-headed
  • Fiery
  • Scatterbrained
  • Silly
  • Reckless
  • Loud
  • Destructive
  • Funny
  • Forgetful
  • Honest
  • Emotional
  • Misbehaved
  • Sensitive
  • Insecure
  • Kind
  • Somewhat Heroic
  • Selfish
  • Mentally Handicapped
  • Brave
  • Perverted
  • Caring
  • Intelligent
  • Happy-go-lucky
  • Grateful
  • Bratty
  • Spoiled
  • Whiny
  • Hard-headed
  • Aggressive
  • Hair Triggered
  • Bad Tempered
  • Cruel
  • Harsh
  • Abusive
  • Mean
  • Strict
  • Severe
  • Generous


Jeffy has proven numerous times to be one of, if not SML's most controversial character. Many fans have criticized him, ever since his debut, saying that he's an offensive stereotype of the mentally disabled. Logan responded to these claims by saying that Jeffy was meant to be similar in-vain to Chef Poo Poo, not mentally disabled.

After "Jeffy's Bad Word!" and "Locked Out" were released, Jeffy received an immense amount of hate from dabhdude and SML's older fans, due to his downright, horrible behavior towards Mario that would usually land him in trouble, due to Jeffy lying. Worse, Jeffy had now begun to grow a fanbase, of mostly children and young teenagers, adding even more controversy. After "Jeffy's Parents!", despite some still hating him, most started to feel sympathy towards him, due to the reveal of his backstory, with his mother, Nancy.

Jeffy's fanbase, only grew more when "Jeffy The Rapper!" and "Jeffy's Fidget Spinner!" were released. These videos exploded in popularity, and caused children to fall in love with Jeffy. Getting to a point, that some even began treating him like a god. Older fans immediately took immense hatred towards Jeffy's newfound fanbase, due to their constant demand for more Jeffy videos, disliking ANY that didn't feature him. In "Jeffy's Fun Day!", he received a poor reception. Whilst never confirmed on whether or not some had begun treating Jeffy like a god, an example of what they could be like, can be seen in the SML Creepypasta, Not As They Seem, in which they served as the main antagonists. They're portrayed, as a group of six completely insane individuals, who's devotion to Jeffy had reached a point, that they had created an entire religion around him. Worse, Jeffy was now starting to be imitated by his young viewers.

On December 12th 2017, UK tabloid company The Sun, reported that a seven-year-old boy had attempted to hang himself with a noose, in a similar way to how Jeffy almost did in "Jeffy's Tantrum!". The mother of the child discovered this and reported the news to The Sun. Rather than blaming herself, however, she chose to blame Logan. The article can be viewed here. Logan then apologized and assured that his videos are not to be imitated; despite this, YouTube started demonetizing and age-restricting all of his videos. A few months later, "Jeffy The Rapper!" was reported on by the news, as second to third-grade-children were now being disciplined after mimicking Jeffy's behavior (mostly boys). A now private YouTube video showed an entire school bus of children singing Jeffy's song in the video, "Why?".

In late 2018 and early 2019, Jeffy had now become universally despised, as his actions and use of words were deemed inappropriate by many. The younger fans began outnumbering the older fans, by pressuring Logan to make more Jeffy videos, to the point that every video, where Jeffy was absent, such as "Toad's Mistake!" (2017) and "Attack of the Killer Shrimp!" were panned by younger viewers simply because he wasn't there. Worse, classic characters like Woody, Shrek, and Mr. Pig, were heavily affected by Jeffy's takeover, as his increase in popularity, caused them to rarely, or in the case of some, never appear again. During the break-up drama in 2020, it was revealed that Chilly had pressured Logan to push Jeffy as SML's main star.

Jeffy's popularity has now reached a point that Logan is incapable of writing, or killing him off, without losing most of his subscribers, resulting in him instead coming back in some way, even after he appears to have actually been killed; worse Logan's address is publicly known, meaning if Jeffy were to be removed from the series, he would put his house, and friends, at risk, of being attacked, by hundreds, if not, thousands of angry Jeffy fans. Not as They Seem, also points this out, as the creepypasta's main protagonist, Cassey Green, stated that Logan would lose the same amount of, if not, more subscribers, than he did when Mama Luigi was killed off, if he were to do the same to Jeffy.

In modern day, the SML fanbase has accepted that Jeffy's stay is permanent, and has gotten used to the fact that he's SML's breakout star, and the mascot of the channel. It's not to say that not everyone has accepted this, however, as to this day, Jeffy remains heavily disliked by a big portion of the internet, and wish Logan would get rid of him, he was never made in the first place, or both.


Jeffy is known to give his pets vulgar and inappropriate names, and most of the time he doesn't take care of them properly.

Pee Pee Suck (fish)[]

Pee Pee Suck was Jeffy’s pet fish that made an appearance in “Jeffy's Pet!.” However, Jeffy later ate him whole. His skeleton was seen in Jeffy Gets Stung by a Bee!.

Pee Pee Suck 2 (hamster)[]

Pee Pee Suck 2 was Jeffy’s hamster from "Jeffy's Pet!". She is also known as Melvin. However, in "Jeffy's Dog!", she went missing, and Brooklyn Guy was her new owner. She was mentioned to be dead in "Bowser Junior the Faker!".

Poopy Butt[]

Poopy Butt, formerly called Shitass was Jeffy’s dog from "Jeffy's Dog!". He was paralyzed from the neck down, because Rosalina got him from the animal shelter. Unaware of this, Jeffy gives him a "walk," by just dragging him across the street. His first death was in "Jeffy Gets Glasses!", where he was euthanized. In "Jeffy's Bad Dog!", he died from chocolate poisoning, but was later revived. In "Jeffy's Swimming Lessons!", he drowned. He was seemingly gone for good, as he didn’t appear again after that, however, he returned in "Mr. Goodman's Dog!".


Booger was a more exotic pet that Jeffy had. In "Jeffy's Pet Dinosaur!", he hatched Booger from an egg. However, it was a bad idea to keep Booger, because she isn’t house-trained. Mario once sold her to the Loan Dolphin in "Brooklyn Guy Pet Detective!". Also, Booger stopped appearing after "Jeffy Plays Baseball!", so it’s unknown if Jeffy still has Booger. However, this changed in "It's Ya Boy Duggie!", where it's shown that Jeffy has kept Booger as a pet. Booger was also revealed to be female in "Jeffy's Eggs!".

Orange Zebra[]

Orange Zebra was another exotic pet. He made his first appearance in "Jeffy's Pet Tiger!". However, he was way too dangerous to keep.

Loan Dolphin[]

Loan Dolphin was Jeffy’s temporary pet in "Jeffy's Pet Dolphin!".

Mr. Sharky[]

Jeffy once captured the Shark from the gulf when he went fishing in "Jeffy's Pet Shark!". Unfortunately, Jeffy had to throw the Shark back in the water, due to it being illegal to catch sharks. The shark immediately got eaten by a larger shark as soon as he was thrown back.


So far Jeffy has only created three inventions, one of which is the Piss Pal.

  • Clamp-'O-Wiener: A simple invention just consisting of a wooden pin that clamps one's wiener shut.
  • Pee Backpack: A tube attaches to one's penis and the other end leads to a backpack.
  • Piss Pal ("Jeffy's Invention!"): A smiley-faced sponge that is used for preventing peeing in someone's pants and reusing them every time someone uses one. On Shark Tank, Jeffy receives one million dollars after Pooby makes a deal with him. This then leads to him getting a Cease and Desist letter from the original company. The Piss Pal is actually a Scrub Daddy, the original invention that Jeffy stole from.


Despite his age, Jeffy has had his fair share of children, with most of them dying because of negligence.

Puss Hole and Puss Hole 2[]

Puss Hole and Puss Hole 2 were baby Cheerio boxes, and two of Jeffy’s children from "Jeffy's Kids!". They were a baby boy and girl, respectively. They were later "murdered" by being eaten by Bowser Junior.

Jeffy Junior I[]

Jeffy Junior I was Jeffy’s other kid from "Jeffy's Kids!". He looked a lot like Jeffy, except he was covered with Cheerios and had darker skin than Jeffy. And he always shit his pants. When Jeffy tries to potty train him, he flushes himself down the toilet, presumably drowning him.

Jeffy Junior II[]

Jeffy Junior II is a hybrid of Jeffy and Junior from "Pregnant Jeffy!". He was made thanks to Harry's impregnator invention. Jeffy Junior II was proven to be super annoying, but he also likes Mac and cheese like Junior and cat piano like Jeffy. Later, he destroys Junior’s Golden Thomas, and Jeffy’s cat piano. Jeffy Junior II was sold to Jackie Chu.


Jeffica is the accidental kid of Jeffy and Rose from "Jeffy's Daughter!". She was accidentally made by Jeffy's "baja blast" instead of Marvin's. Marvin paid a hawk to take Jeffica away.


  • "Why?" (former catchphrase)
  • "(grunting)" (Note: Often spelt by fans as "UH". In Jeffy Gets Hypnotized!, Jeffy claims the grunting noise cannot be spelt and it's not a word.)
  • "I don't like green beans!"/"I HATE GREEN BEANS!!"
  • "Dent Haf Tew"
  • "Ole' [random thing/item] dick, [purpose of random thing/item] and shit.”
  • "NO FUCK!"
  • "Paperrr Cash Cash Paperrr"
  • "Well then I banish you to the dungeon!"
  • "PP"
  • "Hey, Daddy. What doing?"
  • "Oh I'm about to whack that shit!"
  • "You said Jeffy's a bad boy?!"
  • "Whoops."
  • "I found it."
  • "Moose fuck!"
  • "I don't even know."
  • "It feels good on my pee-pee."
  • "Tacos gave me diarrhea, and it is in my pants!"
  • "Feed me, I'm a giraffe."
  • "My sales are up, and my syndrome is down!"
  • "It's not my fault my hopes are up and my syndrome is down!"
  • "I guess I do have to."
  • "Why you do that?"
  • "My name is Jeffy, see? It says it on my shirt, Jeffy."
  • "¡Si papi, yo quiero mas papi!"
  • "Ohhh! ___, Daddy!"
  • "Bep!"
  • "I don’t have to." (Note: Because of the accent, the word "don't" was pronounced as "din't", which makes some fans think he's saying "didn't".)
  • "Wanna see my pencil?"
  • "I love animals! My favorite animal's a carrot."
  • "Fuck this helmet, fuck this pencil, and fuck this diaper!"
  • "I don’t like it."
  • "That's so, PP!"
  • "Daddy, you're high as fuck!"
  • "I'll talk to em!"
  • "I got a wicked camel toe."
  • "PAPER!"
  • ”DADDY!!!”
  • "Hyelo. My name is Heffy." (Him in a Russian accent saying hello to Vicky in "Jeffy's Fairy Godparents!")
  • ”I don’t want to.”
  • ”I don’t want you to.”
  • "I'm here, fuckers!"
  • "Ol' hippo dick! Ol' seacow motherfucker!"
  • "It slipped, Daddy."
  • "The new SML store is now open, so go check it out at!"
  • "HOW HIGH ARE YOU?!?!"
  • “I love you!”
  • "Good."
  • ”Daddy, I didn’t start anything! I’m a perfect angel!”
  • "I wanna be a moose. Ol' moose-fuck."
  • "Where hippo??"
  • "DADDY- DADDY, that is not fair..."
  • "UH-HUH!"
  • "Doodle, Doodle, Pencil Fart!"
  • "Go away, fag**t!"
  • "Daddy's gonna be mad!"
  • "Hey, Santa Claus! F, U…N! That spells fun!"
  • "If you ground me, then you're.. you're mean."
  • "Ligma balls, daddy!"
  • "Listen here, motherfucker! If you throw another goddam paper ball at me, I will fuck your shit up! I am not to be fucked with.”
  • ”Daddy, the first day you let somebody walk all over you, is the day you become a bitch. And Jeffy ain’t no bitch!”
  • "YUMMY!"
  • ”Well I done shit myself, daddy! My pants are all full of fuck.”
  • "Booty, bitches, and bacon."
  • "Toot, toot, fuck, shit!"
  • "I hate green beans! I like carrots! I like carrots! I like carrots! And my daddy's the tooth fairy, tooth fairy, tooth fairy! (grunts seven times)"
  • "What's up, ni**a?!"
  • "I get fat hoes!"
  • "Skeet, skeet, butthole, daddy!"
  • "My pee-pee looks like a flute. Ee! Ee! Ee!"
  • "I'm down...syndrome."
  • "Oh hell naw, come on daddy, let's tagteam this motherfucker!"
  • ”Feebee, are you okay?! Feebee? Wake up Feebee, talk to me! Mommy!!” (After Feebee's death)
  • ”Well Daddy, I think she wants to be a tree. Cause she’s sleeping in the ground..”
  • "But daddy..."
  • "Squeakity, squeak squeak squeakin', squeaker."
  • "That is the tits."
  • "Balloon tits!" (variation of "badum tss")
  • "Ok. I promise I won't go "Oh, si papi!". Give me a good spanking. Put some hate behind it."
  • "Awww, give me some pizza Daddy!!!"
  • "Hold up, freeze frame! You guys see this?"
  • "My daddy is the Tooth Fairy!"
  • "I'M OUT, BITCH!!!!!!"
  • "Baboo bap, bap, baboo."
  • "I hid it in off-shore bank account so no one could track it."
  • "Damn."
  • "I got you Junior, say a word, a single word, and I'll blow your brains off and you'll never see your family again!"
  • "Make my bay, hoe."
  • "My butthole hurts!"
  • "SHUT THE FUCK UP, JEFFY!!!" (Jeffy when he switched bodies with Mario)
  • "Hey! What doing? What doing with that ka-nife?"
  • "What's a bus?"'
  • "I get to go first because I have a disability!"[10]
  • "Ding! Ding! BAP!"
  • "Here ye, here ye, I am the doughnut king!"
  • "Um, daddy, why is this big Cheerio gold?"
  • "Uh-oh!"
  • "I want my booger back!"
  • "Again, thanks for caring, daddy."
  • "I got a 2-inch pipe it can clean."
  • "Hoes, hoes, hoes!"
  • "So you're telling Disney new cars...and I only get markers?"
  • "I plead da fifths!"
  • HAHAHAHAHAHAHAHAHA!” (Jeffy Laughing)
  • "I got a pretty cool daddy!"
  • "It's a pee pee, Daddy!"
  • "HOYOYOI!"
  • "I'm talking deforestation, bitch!"
  • "The internet is dick!"
  • "Daddy.. Please don't make me go with her.. She hits me and calls me bad names.."
  • "I snore in Russian."
  • "Shibby!"
  • "Hey, hey! No hitting!"
  • "This is deserved. I am a shithead."
  • "Someone pooped my pants."
  • "Mm-mm. I don't want my peas, I want marshmallows!"
  • "Oh, I am ready for bed, Daddy. See I got my bunny suit on, I got my carrots on, I'm ready for bed."
  • "Yeah so check it, this is what I want. I want two hot dogs—boiled—Then when you're done cooking them, I want you to put them on a plate loosely. No bun or anything because I like to watch them roll around. Then, on the center of the plate, I want you to put ketchup and mustard on there, but it's up to you to balance the place so the hotdogs don't touch the ketchup and mustard. Because if they do, then you're gonna have to start all over again. And then to drink, I want some of the water that the hotdogs were cooked in with milk. Then, once you got all that together, go ahead and put that in the trash because I'm not gonna want that either." (Rose didn’t like that.)
  • "My balls itch."
  • "Oh boy, oh boy, oh boy, oh boy cookie time, hehe!"
  • "Yeah I'm talking, paper, like 'pee-pee', but with cash, daddy."
  • "I just let out a big stinky shit cloud right outta my rectal hole."
  • "I need- I- need-... COOKIES!"
  • "Heeeyyy!!!"
  • "More tushin' for the pushin' daddy."
  • "Stick it into my squirrel caboose!'
  • "There are more pieces to this that are ants in the world!'
  • ”Pumpernickel fuck.”
  • "Wah. Wah. Cry, cry, wah, cry, wah, wah cry."
  • "I had cream cheese covered deviled eggs and 1 acorn I found outside." (Jeffy, after he farted on Marvin)
  • “DIE BITCH!” (Jeffy, after shooting Nancy in the head)
  • "Ooh I wanna __, pick Jeffy to __" (Older Videos)
  • "I got more ping than a Chinese phonebook!"
  • "You parrot nosed fuck!"
  • "You gon' get hyit, byatch!"
  • "HEEEEEYYY!! You hit my eyeball off!"
  • "Goofy goober yeah!"
  • "Was it taste good?"
  • "Oh, bee needle dick!"
  • Hey Junior! Check out my pet old man.
  • "That would be, the tits."
  • "Alright Daddy, Open up a pack of these Reesee's Pussies!" (Jeffy, right before he breaks character in Jeffy’s Big Halloween)
  • "Where's hemorrhoid at?" (Referring to Hermione Granger from the Harry Potter series)
  • "HAHAHAHA! Why'd it do that!?"
  • HANG UP THE PHONE, BITCH!” (used in Breaking Bad!)
  • "I am a shithead."
  • "That's my shit!"
  • "Stupid dog, you make me look bad!"
  • "More cushion for the pushin', daddy!"
  • "Hey daddy, what color playdoh taste the best?" (used in Brooklyn Guy The Babysitter!)
  • "Hey dada look, I got a lalapop."
  • "Hey dada look, I gotta big ice cream cone you wanna bite? Abarbarbarbar!"
  • ”Oh no, I’m losing. It’s probably because I’m missing a chromosome. Oop, found it!”
  • "That’s fair, I am a shithead."
  • "I'm Lack Toes intolerance"
  • "RUN DADDY, SHE CRAZY!" (Jeffy when Marvin gets chased by Rose with a hammer)
  • DADDY, THE FUCKERDOOS GOTTA GO!” (Jeffy telling Marvin the Huckerdoo kids need to leave after Susie Huckerdoo breaks his Cat Piano.)
  • "It's my favorite."
  • "NO! FUCK THAT, BITCH!" (Jeffy before attacking Judge Pooby to avoid sentences)
  • "Hold on. I need to tell you something!" (Jeffy telling Marvin about his chores in Jeffy and The Jeffmunks!)
  • "Tutti Frutti, On Booty"
  • "I'm here to fingerpaint and fuck and I'm all out of poop"
  • "O'le _______ dick! Likes _______ n'shit!"
  • "Cause I'm a fuck!" (in Jeffy's Lie Detector!)
  • "FUCK YOU, DADDY! AND FUCK THAT COUCH!" (Jeffy after throwing a couch in Jeffy's Tantrum!)
  • "FUCK YOUR FAMILY!" (In Jeffy's Fast & Furious)

Forms and Variations[]

Sick Jeffy[]

Sick jeffy by jeffy jeffy-dbmsi4j

Sick Jeffy

Sick Jeffy is Jeffy with the flu, taking way greater effect than normal would with other characters such as Mario, and having a chance of giving others the flu. His appearance also changes to rundown, tired, and overall extremely droopy. The puppet was made by a fan known as Matt'zStudioz. This version of Jeffy appeared in "Jeffy's Flu Shot!".

Smart Jeffy[]


Smart Jeffy

Smart Jeffy is a variation of Jeffy, appearing in an episode of the same name, who is incredibly smart compared to his normal form (and everyone else), due to his pencil having impaled his brain because of a freak accident indirectly caused by Junior. However, at the end of the video, Jeffy sneezed, blowing his pencil out back down his nose, leaving a hole in his brain, and reverting him to his normal form.


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A rapper variation of Jeffy that sings the songs "Why?" and "Wanna See My Pencil?."He has gotten arrested twice; the first time for shooting an elderly woman and opening up somebody's mail, the second time for slapping a girl. This version of Jeffy appeared in "Jeffy The Rapper!", "Jeffy The Rapper 2", "Precious's Biggest Fan!" and "Jeffy's Diss Track!"

Green Bean Jeffy[]


Green Bean Jeffy

Due to the Green Bean Giant being angry at for not eating green beans, he cursed Jeffy and transformed him into a human-size green bean. The curse eventually wore off after Jeffy ate a whole plate of green beans, reverting him to his normal state. This is the primary reason why Jeffy no longer complains about green beans until "Jeffy's Cat Piano Problem!". This variant appeared in "Jeffy And The Beanstalk!".

Redneck Jeffy[]


Redneck Jeffy is a variation of Jeffy with a Redneck's brain in his skull. After Jeffy sneezed his brain out, the doctor accidentally dropped his brain in his recycled brain bin, and they had to spend 8 hours picking out random brains, one of the brains was the Redneck's brain. He wears a Sombrero, rattles a Maraca, and talks in a Southern accent. This version of Jeffy appeared in "Jeffy's Brain!". He also sounds a lot like Woody.

Drawing/Play-Doh Jeffy[]

For More information check out Drawing Jeffy

Drawing Jeffy is a clone of Jeffy that he accidentally created by saying "Doodle doodle pencil fart!" Junior traps him into a piece of paper, and he is not seen until "Jeffy Sneaks Out!", where Jeffy accidentally revives him with Play-Doh. He is shot and killed by Mario. This is the variation of Jeffy that has had the most appearances. The puppet for this version was made by a fan. He also killed Simmons, Brooklyn T. Guy's best friend but threatened to kill Mario and Rosalina which makes him a villain.

Jeffy App Salesman[]


Although not a form or variation of Jeffy, it is an identical person, looking and talking exactly like him, aside from wearing Marx glasses. This version of Jeffy appeared in "Jeffy's Tantrum!".

Angry Jeffy[]


Angry Jeffy

Jeffy turns way more angry than usual after eating tic-tacs. He gets so mad that he even shouts at Junior, who is one of his best friends. It looks like the normal Jeffy, but with big slanted eyebrows. He appears in "Jeffy Gets Help!".

Depressed Jeffy[]


Depressed Jeffy

Jeffy's face gets really messed up, similar to Drawing Jeffy. However, he is black and white and is suicidal. This form's Jeffy isn't energetic like his normal self. This happened after eating tic-tacs. The puppet for this version of Jeffy was made by a fan. He appears in "Jeffy Gets Help!". He reappears in a Chilly vlog, where he went to the airport to fly to South Florida. This puppet was reused later on "Ghost Jeffy!" as Jeffy's ghost form.

Wig Jeffy[]

Wig Jeffy

Jeffy has lots of overgrown "hair" that needs to be cut. After Mario sees him, he goes to call a Hair Cutter to cut Jeffy's "hair." Before he cuts it, Jeffy shakes his head, revealing that it is actually a wig.

Taco Jeffy[]

Jeffy dresses up in his taco suit. His appearance is a standard hard-shelled taco with meat, lettuce, and cheese. Jeffy asks Mario to buy him tacos from Taco Bell because it's Taco Tuesday. Jeffy's body can still be seen behind the taco, with Jeffy's head sticking through the front of the suit.


For more information, check out Scooter.


Scooter is a clone of Jeffy. He was made by Cody's Crazy Cool cloning machine (or C-C-C-Cloning machine). They had a short relationship with each other as he was shot in the face with a Nerf gun by Bowser Junior only minutes after he was made. He likes to say "Hey fat boy, wanna fight?"

However, after an absence for two years, Scooter returned in "Jeffy and Junior Skip School!"

Baby Jeffy[]


In Baby Jeffy!, Jeffy drank too much youth juice, turning him into a baby. Baby Jeffy starts fighting against Brooklyn T. Guy and beats him up. This is also the only form of Jeffy that has toes. He also appears in "Jeffy Ball Z", as a presumably separate character under the name Jeffy-Han.

Old Jeffy[]


Old Jeffy

In the episode "Baby Jeffy!", Jeffy drank too much old juice, turning him into old Jeffy. Old Jeffy has gray hair instead of brown hair. Although he acts like normal Jeffy, he acts slower than normal. He shares a similar appearance and voice with Harold Wilfred.

Zombie Jeffy[]

In the episode "Zombie Jeffy!", Mario presumably kills Jeffy after shooting a green bean down his throat causing him to choke. While Rosalina and Mario are mourning the loss of Jeffy, suddenly he shows up again and Mario, Rosalina, and Brooklyn T. Guy try taking care of him and Brooklyn T. Guy talks to him in Zombie language. They get Mario to stick his head in a porta potty for 10 minutes, and afterwards they reveal that everything was a prank, and Rosalina put makeup on Jeffy, and Brooklyn T. Guy amputated his arm, which they had to get sewed back on later.

Pregnant Jeffy[]

Jeffy's Pregnant form

Pregnant Jeffy

In the episode "Pregnant Jeffy!", Harry turns Jeffy pregnant with his impregnator invention, which he ends up giving birth to Jeffy Junior II in the video as of a result of becoming pregnant from Harry's impregnator machine.


Jeffy in his Handsome form

Handsome Jeffy[]


Jeffy with his Handsome outfit but with his normal face

In the episode "Handsome Jeffy!", Jeffy gets into a car accident with Marvin, which causes Jeffy to be injured, having both of his eyes popping out, and blood on parts of his face and on his eyes. So, Brooklyn T. Guy gave him plastic surgery and he ends up looking handsome with a fancy white shirt and suit, a bow tie, straight row of teeth, had his crooked eye fixed to not be crooked, eyebrows, slicked hair, new nose (with a tracker installed there), no pencil, and no diaper. This form didn't last long as PJ hits him in the face with a mallet because Jeffy stole his girls, which this causes Jeffy's face to look ugly again with the unibrow, his crooked eye returned, nose went back to normal, his pencil returned, and he had his buck teeth return.

Possessed Jeffy[]

Possessed Jeffy

Possessed Jeffy

In the episode "Jeffy's Exorcism!", Jeffy gets possessed by a demon after Jeffy goes up to the attic and mess with a box of Haunted toys, which he assumed that the box of Haunted toys was a box of special toys that Santa made that he doesn't want anyone to play with, which he got possessed after using the Ouija Board, which the demon tells him to open his mouth, resulting in him getting possessed. The demon (Now inside of Jeffy) caused trouble as he made Jeffy pee on the plate of Green Beans, as well as made Jeffy throw up on his bed. This form didn't last long as Marvin called a exorcist (Who was Brooklyn Guy) to expel the demon out of Jeffy, which the exorcist tried using Holy Water to expel the demon out of Jeffy, but that didn't work. So, the exorcist decided to trick the demon into expelling out of Jeffy by telling the demon to possess him instead, but while the demon was expelling out of Jeffy, he put the Buzz Lightyear toy in front of the demon, resulting in the demon processing the Buzz Lightyear toy, which the exorcist throws the possessed Buzz Lightyear toy down the stairs.

Jeffyku Jeffy[]

Jeffy as Goku

Jeffyku Jeffy

In the episode "Jeffy Ball Z", Jeffy is Jeffyku or Jeffy as Goku and his mission is to find all the dragon balls to make a wish. While he searches for the dragon balls he faces many enemies but is able to defeat them with his different abilities. His powers are superstrength, ability to control Ki energy, and he has a lightsaber. Once Jeffy collects all the dragon balls and tries to make a wish Brooklyn Guy steals his wish. Because of this Jeffy attacks Brooklyn Guy leaving him beaten. Jeffy Ball Z is a series with 4 episodes. During these four episodes, he gets more experienced and powerful, but so do his enemies Vegeta/Junior, Nappa/Joseph, Brooklyn Guy, and Lord Frieza/Lovell. In "Jeffy Ball Z Episode 3" Jeffy defeats Nappa, Vegeta, and Lord Frieza. But when he tries to use his wish Brooklyn Guy steals it again and becomes very powerful. Even powerful enough to knock Jeffy out. In "Jeffy Ball Z Episode 4", Lord Frieza comes back. Brooklyn Guy loses his powers, and Marvin, Rose, Brooklyn Guy, and Junior get killed by Lord Frieza. Jeffy and Lord Frieza fight, and Frieza gets sliced in half. Jeffy finally wishes to bring everyone killed by Frieza back.

Jeffy Wick[]


Jeffy Wick

In the episode "Jeffy Wick, Jeffy becomes the most gruesome hitman in the world, known as Jeffy Wick as he wanted to seek revenge on 2 Russian Gangsters (Mr. Meaner and Face Eater) after they killed his dog, Winn-Dixie and stole his 2007 PT Cruiser, which he managed to succeed in getting revenge on the 2 Russian Gangsters in the episode.



Before Season 9, Mario and Jeffy formerly had bad blood against each other. Mario also hates his stupidity and how he can be annoying sometimes. Although he is protective, such as when he lost Jeffy where he eats, and when Jeffy had a gun, he was looking and telling Jeffy to put the gun down (even though he should've been happy because he wouldn't have to deal with Jeffy anymore). He also shot Jeffy with a Nerf gun in "Bowser Junior's Nerf War!". In "Where's Jeffy?", Mario abandoned Jeffy at the park. However, when Jeffy turned smart, Mario liked him very much and told him that he was proud that he was his son, and was sad when he turned back to normal due to him losing the international world smart person contest.

Untitled by awfulfanvore-db79gt2

Jeffy with Mario

However. in the episode "Jeffy's Parents!", it showed Mario's good side on Jeffy and he officially adopts him. He missed Jeffy when his mother came to take him home. Mario called the cops on her and took her to Jail for Child Abuse, Prostitution, and much more bad things. After learning about Jeffy’s tragedy and how his former father was a millionaire and killed himself and give all his money to him, Mario now officially adopts him and they are now officially father and son.

Despite their differences, Mario and Jeffy still love each other deep down, and can't live without each other, developing a relationship similar to Bowser Junior and Chef Pee Pee or a relationship similar to Bowser Junior and Bowser.

Status: Adoptive father and son

Bowser Junior[]

Rock paper sissors

Jeffy with Bowser Junior

Considering how widely popular and relevant both characters are, Jeffy and Bowser Junior are very good friends. They enjoy hanging out with each other and make a good team.

When Jeffy and Junior met for the first time in Bowser Junior's Game Night 3, Junior called Jeffy awesome for surviving a game of Russian Roulette. Jeffy was indirectly also the reason for Mario and Junior permanently recognizing each other starting from that episode, and he also seems to like Junior. As of recently, both Junior and Jeffy seem to get along more, as shown in Shrek The Babysitter! and Smart Jeffy. Junior even caused the main plot elements of Smart Jeffy and Jeffy Loses His Teeth!, wherein he made a jump from a trampoline and hit a table in the former, and accidentally knocked one of Jeffy's teeth out with a T-ball bat in the latter. However, Jeffy and Junior have had major conflicts between each other in the past, such as Junior being responsible for the death of Jeffy's children Puss Hole and Puss Hole 2 in Jeffy's Kids!, a deleted video. He also made fun of Jeffy by calling him a “loser” at school one time when he brought his teddy bear “Beary” to school in Jeffy's Teddy Bear! Despite this, they generally seem to be on a good term regardless. After Jeffy and Junior skip school, where Jeffy agreed with junior to skip school to go mini-golfing. He and Junior are now best friends to a point where junior plays with him more than Cody and Joseph. In Jeffy and Junior's Big Heist, Jeffy helped Junior retrieve Charleyyy’s underwear and getting him to sign it as they both disguised as people from corporate to make him sign it. He and Junior are now best friends and behaved like brothers.

Status: Best Friends


Cody and Jeffy are good friends. Although sometimes Jeffy can get on Cody's nerves, Cody doesn't mind this. Cody finds Jeffy extremely stupid as seen in The Test! when he fails to teach Jeffy proper math. Along with Bowser Junior. Cody sometimes finds opportunities to rape Jeffy, it is unknown if Cody was able to rape Jeffy in The Remote! as Cody sometimes finds Jeffy attractive.

Status: Neutral (enemies on some occasions)


Prior to the flashback in the episode Jeffy's Parents, Jeffy was shown to actually like Nancy before she abandoned him.

Nancy was shown to be very abusive towards her son, to a much higher extent than Mario was. Jeffy used to be scared of Nancy. However, in Jeffy's 18th Birthday! it is shown that Jeffy is no longer scared of her and he hated her. Nancy acted as she cared about him when people were around, but when they were alone, she would always beat him. Nancy eventually got arrested and Jeffy ended up getting adopted by Mario.

Later in Jeffy's 18th Birthday!, Jeffy was taken after showing up in the field to rescue Marvin and him and the cops started chasing the van to get Jeffy. While they're still chasing them, He tries to resist and tries to get the gun, but his mother holds her gun closer to him. Once, Screwball says about losing their gas, Jeffy snatches Nancy's gun and shoots her in the face, Jeffy jumped out of the van as Simmons causes it to explode.

Status: Former Enemies (Because she’s presumably dead.)


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Rosalina showing concern for a scared Jeffy.

Rosalina wearing one of jeffy’s helmets and shirts

Jeffy and Rosalina seem to get along well, going to where Rosalina copies Jeffy a lot. He usually calls Rosalina "Mommy" just like how he calls Mario "Daddy." Rosalina acts like a deep motherly figure to Jeffy, to the point of sometimes caring more about Jeffy, and calling Mario out whenever he abuses Jeffy, even breaking up with Mario when he heartlessly let Jeffy go with Nancy. She most likely does this as she wants to be the mother Jeffy was "supposed" to have as Nancy abused him which makes Rosalina mad as she absolutely hates to a point at even trying to break up with Mario as he tried to give Jeffy back to Nancy. He will yell at her occasionally if he does not get his way, but despite this, He mostly loves her as a mother. Rosalina is more loving and caring towards Jeffy to the point where she acts as a motherly figure and calling Mario off whenever he gets angry at Jeffy.

Status: Neutral (Friends on Rosalina's side)

Jacques Pierre François[]

Not much is known about Jeffy's relationship with his dad, world-renowned French painter Jacques Pierre François, who had faked his death to make his paintings more valuable. Due to the fact that Jeffy's "IF LOST" paper contains Jacques's name and address information, this could imply that Jacques used to care about Jeffy. Jeffy has also claimed that he learned basic French from his father. However, in Jeffy's 18th Birthday, Jacques told Jeffy to "fuck off" on live television and left him with none of the fortune. As of now, Jeffy is completely unaware of his father's contempt towards him.

Status: Neutral


In Jeffy's Sister!, it was revealed that Jeffy has a twin sister named Feebee. Jeffy and Feebee are very similar in character, with nearly exactly the same traits. They can even communicate with each other through diaper patting. However, it was revealed in Jeffy's Sister Returns!, that Jeffy's twin sister Feebee was killed when she got hit by a truck while riding a bike and died back in 2015.

Status: Siblings

Brooklyn T. Guy[]

Most of the time, Brooklyn T. Guy doesn't seem to mind and cares about Jeffy, as shown in episodes such as Mario The Babysitter!, Jeffy's Bad Word!, Jeffy Goes To The Zoo! and Locked Out. But he still likes him as a friend. However, in the third episode of Who Wants to Be a Millionaire? Brooklyn Guy is shown to get annoyed with Jeffy's behavior and is sometimes Jeffy’s arch-rival

Status: Friends (Enemies on occasions)

Chef Pee Pee[]

Jeffy seems to like Chef Pee Pee, but Chef Pee Pee, like Mario, does not seem to have the patience for Jeffy. For instance, he got annoyed with when Mario and he were trying to get to eat his green beans. Chef Pee Pee also seemed upset when Jeffy ruined the pencil cake Chef Pee Pee made for him. When Chef Pee Pee babysat Jeffy, he was so annoyed by Jeffy's shenanigans to point that he would've killed Jeffy if Mario hadn't shown up in time.

Status: Neutral

Black Yoshi[]

Jeffy doesn't seem to have much of a relationship with Black Yoshi. The two have only unofficially met in one video Jeffy's Mistake! but the events in that video are a dream. However, Black Yoshi and Jeffy have mentioned each other many times in future episodes, like Jeffy's Piggy Bank! and they seem to rather have more of a positive relationship rather than a negative one.

Status: Neutral


Jeffy and Shrek don't seem to have a good relationship because Jeffy locked him in the bathroom and ate his cheesecake along with Bowser Junior so Shrek locked both of them in the bathroom with the toilet clogged. However, Shrek was on friendly terms when Jeffy had visited him in Jeffy Ball Z Episode 5, though it is possible he did not recognize him.

Status: Enemies, possibly neutral


Jeffy and Toad seem to be rivals when it comes to the rap game, however outside of rapping, for the most part they seem to be on good terms, even if they don't have much interaction outside of rapping.

Status: Neutral (Enemies while rapping)

Bully Bill[]

Jeffy is a frequent target for Bully Bill. However, Jeffy does not take it lying down, and turns Bully Bill's bullying on him with extreme physical violence. Despite the number of beatings, he has taken, Bully Bill never learns his lesson because he is an idiot.

Status: Archenemies (non-canon friends in "Jeffy's New Friend!")


Jeffy and Bowser don't seem to have a good relationship due to how Bowser accidentally gave Jeffy the flu by coughing in his mouth in Jeffy's Flu Shot!, how Bowser acted harshly towards Jeffy in The Competition! and how Bowser mistook the shock collar remote for the TV remote and repeatedly used it, shocking Jeffy and indirectly framing Mario in Jeffy's Punishment!, as well as how Jeffy was paid by Mario to break Bowser's trophy in Jeffy and Junior Sneak Out!. Jeffy, however, did congratulate Bowser when he won Charleyyy's underwear in Jeffy and Junior's Big Heist!, but other after that, for the most part they seem to be on good terms, even if they don't have much interaction with each other.

Status: Neutral (Enemies on rare occasions)

Jackie Chu[]

Jeffy and Jackie Chu are archenemies. They first met in the First Day Of School!. Jackie Chu never like Jeffy because of his bad behavior and Jeffy hates Jackie Chu because the latter yells at him, kicks him out of class, and makes fun of him by calling him a bitch. Although the two hated each other all the time, but on extremely rare occasions, they kind of have a good relationship with each other, two examples that have the two being on good terms is in The Baby Project! where Jackie Chu gives Jeffy and Junior an A for killing the baby and in The Science Fair! where he gives Jeffy an A+ for melting crayons on his rainbow popcorn project. Jackie Chu also thanks him for save his family's restaurant for serving people cat & dog as orange chicken in Jeffy The Lawyer!.

Status: Archenemies


Penelope and Jeffy seem to be friends though they rarely interact with each other, although in SQUID GAME, Jeffy tells her to shut up. Penelope tells Jeffy to shut up in Junior Goes To Legoland!.

For a 3-legged race in Jeffy's Summer Camp!, they partner up, but Jeffy drags Penelope the whole way across.

In Handsome Jeffy!, Jeffy gets plastic surgery to become handsome. Penelope and some other girls fall for him. Penelope asks for his number, and then she and the other girls proceed to kiss him.

Status: Neutral

Abilities / Superpowers[]

Bringing Drawings to Life[]

Jeffy has a spell called Doodle Doodle _____ Fart. One example was Drawing Jeffy! where Jeffy said, "Doodle Doodle Pencil Fart." Jeffy can only do this with the pencil in his nose.


Jeffy was able to predict the future in Jeffy The Psychic!. One example was when he knew that Brooklyn T. Guy charged Mario 10 grand for wasting his time.

Magic / Flight[]

In Fat Jeffy, Brooklyn T. Guy proved to Mario and Jeffy that they could do anything because they were toys. And when they knew that they flew to the kitchen room. This power was also the main subject and Jeffy's Magical Pencil!. He had the ability to turn people into things/animals/creatures only for the pencil to choose. That was proven when Jeffy tried to fix Mario but accidentally turned him into a Minecraft Zombie due to the pencil choosing so. Everything was fixed when the glitter was washed off Jeffy's pencil. This is proof that the glitter on Jeffy's Pencil gave it the power to turn people into other things/people.

High Strength[]

Jeffy is possibly one of the strongest characters in the SuperMarioLogan franchise, and so is Bully Bill. But that does not stop Jeffy from continuously beating him and others much larger than him, such as Brooklyn T. Guy even as a Baby. In Jeffy the Boxer!, he knocked out D-Money Senior, a once undefeated world champion boxer with a mere two punches, in that same video, he would knock out Logan Thirtyacre and all of his subscribers, Super D, and even God with one punch. In "Jeffy's Bad Christmas!" (2017), Jeffy is able to lift up and throw a Christmas tree a few meters, compared to the size of him and the Christmas tree he seems to be extremely strong. In the same video he also knocked Santa Claus with only one punch.

Ki Control[]

In Jeffy Ball Z, he gained the ability of Ki Control and Super Saiyan (despite not being a saiyan) after he got angry when bully called him an idiot. This meant he was able to use what he would call "Kai Blasts", Spirit Bombs, Destructo Discs, and Goku's signature technique, the kamehameha.

Sleuth Skill[]

In Detective Jeffy, he is shown to have skills as a detective as he is able to find clues better than the police.


  • The Jeffy puppet was made by Evelinka (Eva Gronowitz) from Beacon Art Studios. It can be found on her Etsy page and website, and costs $550.00 USD.
  • Jeffy has had seven birthdays since he was taken in by Mario, making him 19 due to his age being revealed in Jeffy's Parents! when Brooklyn T. Guy read the note with Jeffy's information.
  • Logan said in multiple videos that Jeffy was originally going to be a one-time character, but he turned out to be so big and popular by fans and young children, he became a permanent character in the SML franchise.
    • Many fans have speculated that Jeffy was the main reason for older characters such as Tony, Woody, and Shrek to not appear in more recent SML videos. However, Logan revealed in a livestream that Jeffy was the replacement for Tony, since Lance couldn't do Tony's voice as well as he used to, which upset many older fans.
  • Lance Thirtyacre's Meet the Cast video reveals a few behind-the-scenes aspects about Jeffy.
    • Jeffy was originally going to be named Doofy; however, to avoid confusion with Doofy The Dragon, they ended up with naming him Jeffy.
    • He was originally going to be played by Chris but due to him playing Brooklyn T. Guy he couldn't play Jeffy since it would be hard for him to play two characters in one scene.
    • Prototype Jeffy

      A prototype character with a red helmet that would eventually become Jeffy, seen in an SLL update vlog[11].

      As said by Logan in the video, Jeffy originated from a character that Logan made for an animation during his high school years. This animation can be briefly seen in a SLL update video from 2012, which revealed that the animation was intended to be part of an animated series that Logan had planned at the time, using Logan's own original characters. The character would have been around 6 years old according to the update and was unnamed at the time, though Logan was considering the name Ricky.
    • Jeffy was actually supposed to have a red helmet, but it never happened. He did have his helmet colored red in a video for a few minutes, though.
      • Jeffy also had a red shirt.
    • His prototype character was originally made for a short animation, as explained by Logan in Meet the Cast: Lance.
    • When the SML crew first got the Jeffy puppet, he did not have a diaper, a pencil in his nose and didn't have the name Jeffy written on his shirt. His face was also much more different, as Jeffy's eyes were originally far apart, but due to him looking like a snake, they brought his eyes closer.
      • Sam the Puppet

        Sam the Puppet, the original unmodified Jeffy puppet.

        This specific puppet can also be found on Evelinka's Etsy page and website, under the title "Sam the Puppet"[12], which would imply that Jeffy was originally named Sam, before the SML crew thought what to rename him.
  • Lance's Character Q&A video reveals a few things about Jeffy:
    • His favorite foods are carrots (as seen in "Jeffy the Rapper!") and chocolate cake (first seen in "Locked Out"), although he has never been seen eating the former. He also likes pancakes with marshmallows.[13]
    • Jeffy prefers cats over dogs. This is evident with how he frequently plays with his Cat Piano.
    • Jeffy says he never laughed, but this is untrue, since in First Day Of School!, he is seen laughing with Junior when he put on his name card "poopy butt" (chuckles), and in Jeffy's Trap!, he is seen laughing.
      • It is possible Lance did not remember those episodes or because of how rare it is for Jeffy to actually laugh; it could be why he answered that.
    • The reason why he spanks his diaper is that it "feels good on his pee pee."
    • His favorite color is a carrot (which possibly means it's orange.)
  • According to Logan, the main Jeffy puppet's pants are sewed on. Any time he is seen naked or without his pants, he is shown either from the waist up or a stunt double is used.
  • Jeffy's rise in popularity is actually quite similar to that of Steve Urkel, from the show Family Matters.
    • Originally slated to be one time characters, both gradually begun to appear more, due to how popular they were amongst their respective fanbases after their debut, and eventually became main characters. Although, in Jeffy's case, his popularity started increasing around mid-2016 and early 2017, whereas Urkel was popular ever since his debut episode.
    • Additionally, their popularity resulted in mainstay characters of their shows rarely appearing again. With SML characters like, Shrek, Tony the Tiger, Toad (Lil' T) and more, who had been around since the beginning, not being seen as much, since Jeffy's debut (Tony having made only two physical apperances since), and with Urkel, his popularity had resulted in the complete removal of the character, Judy Winslow in Family Matters fourth season.
  • Jeffy received an immense hatred from most fans in 2016, namely after Jeffy’s Bad Word! however, after Jeffy’s Parents! most fans stopped hating him and started to show him love, though some fans, namely older ones, continue to hate him to this day.
  • Logan has many stunt doubles for Jeffy along with any other character.
    • He reused four Jeffy stunt doubles as new characters. Three were reused into Jeffy's Emotions (Joy Jeffy, Anger Jeffy, and Sad Jeffy) while a fourth was reused into Face Eater.
    • Logan also reused parts of another Jeffy stunt double with parts of a Bowser Junior plush into Jeffy Junior.
  • A YouTuber by the name of Billy Bob Tanley thought Jeffy was a 45-year-old man, but in reality, he is not.
  • Logan has confirmed in a Chilly vlog that he is going to take a break from using Jeffy, as he has caused his channel problems since his debut in Mario The Babysitter!; however, Jeffy will return sometime soon again.
  • It's revealed in Jeffy Gets Help! that Jeffy is allergic to Tic Tacs.
  • Jeffy is one of the strongest characters in the series since he has beaten up Brooklyn Guy, Bully Bill and Santa Claus.
  • Jeffy likes mashed potatoes.
  • Part of Jeffy's full name, Jeffy Jeffy, may be a reference to Mario's full name, Mario Mario.
    • Though, Jeffy's last name is confirmed to be François like his biological father.
  • It has not been confirmed if Jeffy suffers from a mental disability.
    • He is, however, implied to have Down syndrome, as stated in Bowser Junior Kinda Goes Camping!, when he says "I'm down... syndrome," and in Jeffy's Yard Sale! when he says, "My sales are up, and my syndrome is down!"
      • However, his other numerous bad behaviors are reminiscent of autism spectrum disorder and ADHD, and it is possible he could be associated with them as well.
    • In Jeffy's Homework!, Jeffy is revealed to attend "Special Needs School", despite the fact Logan has said Jeffy is not disabled. However, this has since been changed to Jeffy attending the same school as everyone else, suggesting that he is simply extremely unintelligent rather than mentally disabled.
  • In Jeffy Gets Bullied!, it is revealed that Jeffy's belief that 8-4=8 is now being taught as fact, under the name "Jeffy's Law of Mathematics."
    • He also thinks 2+2=Baby 2, 0+0=2, 9+10=910 and 9+3=93. (He originally thought 2+2=74.)
  • His constant abuse by Nancy may be the reason for him treating Mario badly.
  • In the Pokémon series, Jeffy owns a Cookie Monster and somehow taught it Thunderbolt.
  • The first video where Jeffy is first seen without his helmet is Where's Jeffy?.
  • Jeffy has many different poses in the videos' custom thumbnails.
  • He and Brooklyn Guy's birthday also take place the same day the creator of SpongeBob SquarePants, Stephen Hillenburg, was born which is August 21.
  • The song that is used for when he is on-screen is called Doh De Oh by Kevin MacLeod.
  • In Jeffy's Birthday!, it's revealed that Jeffy's birthday is on August 21, and his birth year (2004) was revealed in Jeffy's Parents! after the other half of his "IF LOST" paper was recovered.
  • Jeffy has the same birth date as Brooklyn T. Guy, Hansel and famous runner, Usain Bolt.
  • Jeffy is seen with his eyes bulging in Jeffy's Stupid Home Video!, Jeffy Sleepwalks!, Jeffy's Birthday!, Jeffy's Sister!, and more (including one eye).
  • In First Day Of School!, Jeffy is shown to be in second grade, leading many people to assume he was 7 or 8. Despite being 16 years old, it could be possible Jeffy has been held back six or seven times. It could also be because Nancy never put Jeffy in school before abandoning him.
    • It has been revealed that Jeffy has passed second grade. [14]
  • It is possible that Jeffy puts his pencil in his nose because Jacques Pierre François got famous for putting paint in his nose and sneezing it out.
  • Jeffy is of a French-American descent being born to both French parents but growing up in America. Though most of Jeffy's French Heritage comes a lot from his father Jacques Pierre François, he's become fully accustomed to American culture, accents and life since he was a child even though it's not proven that he's an actual citizen to this day.
  • In "Jeffy's Brain!", it's revealed that his father Jacques Pierre François taught Jeffy to speak French.
  • In Jeffy's Bathtime!, it's revealed that he has aquaphobia, a fear of water.
  • Because of his lack of intelligence and disobedient behavior, it's possible his mother never took him to school before he was forced to move with Mario in his apartment.
  • Jeffy has undergone several changes since his first appearance in Mario The Babysitter!.
    • Jeffy used to bang his head on the nearest surface whenever he was called a bad boy, but this seems to have subsided since 2017.
    • In earlier videos, he was unaware that his pencil was in his nose. In recent videos, he knows that his pencil is in his nose and seems to really care about his pencil as if it were his most prized possession.
    • In earlier videos, whenever he would pat his diaper, he would not respond to anything. He later stopped doing this.
    • In his first appearance, his voice sounded way more different than his new recent voice from April 2016.
    • Jeffy looked more stupid when he made his first debut but has faded away due to the frequent use of him up to Jeffy Sleepwalks!.
    • He used to put other things besides his pencil up his nose such as a crayon or paint brush, but he later stopped doing that.
    • However, Jeffy still hates green beans and broke his promise to Mario in Jeffy's Cat Piano Problem!.
    • From that episode until now, Jeffy looks a bit different.
    • What makes Jeffy look a bit different is because in earlier appearances, Jeffy had no visible gums when his mouth is closed but in later appearances to this day, Jeffy‘s gums are visible when it’s shut. This may be due to ageing of the puppet.
  • Jeffy turned 13 on the same day of The Great American Eclipse.
    • It is also revealed in Jeffy's Birthday Wish! that his birth sign is Leo.
  • On November 22, 2017, Logan uploaded a video on Chilly's channel saying that he'll make some minor changes to Jeffy, as YouTube kept on demonetizing videos that have to do with Jeffy doing inappropriate things, like humping a Cheerios box and swearing most of the time.
  • Jeffy is the second character to solve a Rubik's Cube, the first being Cody.
  • Jeffy, alongside Mario and Brooklyn T. Guy are now the most common characters in the SuperMarioLogan channel.
  • Logan has also stated in an interview with Dabhdude that he wishes that he had never added Jeffy, due to the issues that have arisen after his debut.[15] However, in SML Reacts: Jeffy's Mistake, he does admit to liking Jeffy as a character.
  • Jeffy was not originally meant to always spank his diaper. It was in Mario The Babysitter! where Lance started to make Jeffy spank his diaper out of nowhere. In fact, Logan was originally going to cut the scene of Jeffy spanking the diaper since it makes him seem as if Jeffy was masturbating, however, the majority of the cast members thought it was hilarious and started laughing hysterically so Logan decided to put it in instead and is thus why Jeffy often spanks his diaper in his older videos.[16]
  • As announced in a Chilly vlog, Logan might not make Jeffy in SML videos anymore, that is until Jeffy Plays Baseball! appeared.
  • It is revealed in Jeffy Goes To The Zoo! that Jeffy is implied to be zoophilic.
  • He wears an Up & Up‎ newborn diaper.
  • He wants to be a grown up when he grows up.
  • It was speculated by many older fans that Jeffy's original personality was a replacement for the beloved early-generation characters Mama Luigi and Tony the Tiger because of their dumb antics. In later videos however, Jeffy's personality has changed in a way Mama Luigi and Tony never would have acted, disproving the theory that Jeffy was Mama Luigi and Tony's replacement.
  • He can't swim, as revealed in Jeffy Plays Baseball!.
  • Jeffy's favorite character on SpongeBob SquarePants is Patrick. However, he believes that Patrick is Squidward.[17]
  • Jeffy's way of understanding people is the opposite of his objective.
  • Jeffy is a fan of Naruto.[18]
  • Jeffy and Goodman both curse frequently.
    • Coincidentally, both characters are played by Lance.
  • Jeffy can look both ways at the same time when crossing the street since he is cross-eyed.[19]
  • Due to Jeffy having used the Memory Looker Backer Machine to help finds his pencil in Jeffy Loses His Pencil!, Jeffy is now at an increased risk for a brain tumor.
  • Jeffy has admitted that even though his name is written on his shirt, he still forgets his name sometimes.[20]
  • A metal rod is used for Jeffy to control his arms. That rod is usually on his left hand, implying Jeffy might be left-handed.
  • Jeffy doesn't know his colors.[21]
  • Jeffy's catchphrase "ARE YOU FUCKING High!" could be inspired by Step Brothers in the scene where Brennen and Dale's parents ground them by not letting them watch TV for a week after the two get into a fight which made Brennen mad and shout "YOU'RE FUCKING HIGH!"
  • Puppet of "Puppet Reviews Stuff" hated Jeffy. In his reaction videos, he would always complain or lose his temper every time Jeffy does something stupid.
  • in Jeffy's Lie!, he is shown to turn off his ears and pretends he can't hear anything in a form of ignoring people.
  • Jeffy has worn the most costumes out of any character on SML.
  • There is a difference between SML Jeffy and Kable10 Jeffy, the SML Jeffy would get mad or upset when he gets punished or grounded while Kable10 videos Jeffy, he would be just upset.
  • Older videos showed Jeffy frequently swearing. More recently, he stopped swearing.
    • One of the reasons why Jeffy may not swear a lot like he used to be is because of YouTube's strict rules and Logan not wanting his channel to be shut down or his videos getting demonetized.
  • According to Jeffy's Anger Management!, Jeffy's weight is 120lbs.
  • Unlike most people, he prefers regular Cheerios over Honey Nut Cheerios.
  • Despite not having a passport, he still went to Florida.
  • In Jeffy's 16th Birthday!, he prefers new cars, rather than old cars.
  • Jeffy hates green beans, because they look like boogers. He also implies that he doesn't like eating boogers, unless they come from his nose.
  • As shown in Jeffy's YouTube Channel! and Jeffy's Trap!, he is able to unhinge his jaw like a snake.
  • Jeffy was the last character introduced that became a main character.
  • Every time Jeffy says "Stupid Dog You Make Me Look Bad", it is a direct reference to the famous quote said in Courage the Cowardly Dog.
  • Jeffy was said to be 4'11 in Jeffy's Forest Fire!, however, he is taller than Braxton who is said to be over 6'1 meaning Jeffy is over 6'1 too.
  • Jeffy reveals in The Taser Problem! the he goes by he/she/it/they/them/theirs pronouns.
  • In "Jeffy's Forest Fire!", it's revealed that he 4 feet and 11 inches tall, and weighs 50 pounds. However, it is likely that this is a joke as Jeffy acknowledged his great height by calling himself a "giant" in "Jeffy's BIG Easter!". However, this might be non-canon but just because the voice actors are different, it doesn't mean than it is non-canon, as he is slightly shorter than Goodman who is at least 6'5 - 7'0 or taller, so Jeffy is at least 6'2 - 6'5 or slightly taller.
  • His personality nowadays is similar to Eighteen from Numberblocks, as they usually talk in various exaggerated tones, are really hyperactive and don’t pay attention to bad situations.
  • While starting as a character with lack of intelligence, Jeffy seems to be more smarter as the years progressed.
  • As seen in Jeffy the Rapper 2, Jeffy does not have nipples, unlike Mario.
  • In a vlog titled "IRREPLACEABLE PUPPETS" Logan explains that when the crew aren't using him for a video, he keeps Jeffy locked in a safe because the current Jeffy doesn't have a good stunt double for replacement in case the current Jeffy Puppet gets ruined. It is also impossible for one to replicate a Jeffy puppet that looks 100% accurate in design to the main official one by SML.
  • Jeffy reveals in the SML Gaming video, "ROBLOX NATURAL DISASTERS!", that he has a fear of heights.[22]
  • According to The Opposite Ray!, Jeffy is missing a chromosome.
  • Jeffy's pronouns are apparently he/she/it/they/them/theirs, as revealed in "The Taser Problem!".


Logan has released merch with most of them being Jeffy related, like the Jeffy phone case, Jeffy T-shirt and the newly added most wanted to be the Jeffy Puppet which cost approximately $99 which have currently gem discounted to $75. Most of the shirts and stuff there tend to be pretty pricey ranging from $20-$50. The Jeffy Puppet tends to be the most popular sidling about 80 puppets PER DAY. The Puppet according to Logan is a 24-inch Puppet made from plush fabric outer layer, 100% Polyester inner layer for hand-insert, stuffed with PP cotton. PU leather shoes, and non-woven diaper. The production takes up to 1 or 2 days.

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