| Please note the following:
| "Hey, you wanna see my pencil?
My name is Jeffy, see? It says it on my shirt, Je-ffy."
— Jeffy’s first words, Mario The Babysitter!
Jeffy Jeffy, or simply referred to as Jeffy, is the tritagonist of the SuperMarioLogan franchise and YouTube channel. He is the adoptive son of Mario and Rosalina.
He is the oldest child of Nancy and Jacques Pierre François, and the older brother of Feebee, but since Jacques died and Nancy went to jail in Jeffy's Parents!, as well as the death of his younger sister, he is now the adoptive son of Mario and his wife, Rosalina.
He is the secondary antagonist in Season 8, and the main antagonist in Jeffy's Tantrum!, Jeffy Plays Fortnite!, and his debut episode Mario the Babysitter! Despite being an antagonist in these episodes, he is the main protagonist in some SML episodes, such as Detective Jeffy!, Jeffy's Parents!, Jeffy Gets Bullied!, and Jeffy's Bad Christmas.
Since his debut, Jeffy has proven to be very popular, most particularly with younger fans. Despite his popularity, he has also caused much trouble and controversy and is overwhelmingly unpopular with many older SML fans.
HistoryJeffy was born as Jeffy François Jeffy in a porta-potty at 7 Jeffy Street, Paris, France, on August 21 2004, to prostitute Nancy and painter Jacques Pierre François. They are both of French descent, but Jacques is full-blooded French. Due to not being raised properly, as well as being abused by his mother, he acts really dumb and even still wears a diaper over his pants from a baby. His mother also forced him to stick a pencil in his nose for unknown reasons. He also lost his toes through a unknown incident. This was seen in jeffy breaks his leg
At some point in his life, Jeffy moved to Florida with his parents and Feebee, his little sister, who was later killed in a bike accident by Woody as their mother took her helmet to use as an ashtray. Her death was the reason Jeffy always wear his helmet in normal life.
Jeffy was then dropped off at Mario and Bowser's apartment since his mother was tired of his antics. Jeffy lived with Mario and his family in the apartment (causing havoc around the house, especially towards Mario) before being evicted from the apartment and having to relocate to the new house.
After his wealthy father committed suicide and willed his money to Jeffy, Nancy returned to reclaim Jeffy in order to receive Jacques' money. After being arrested for child abuse, prostitution, and much more, she still hunts for him, even while in prison. Mario chose to officially adopt Jeffy as his son. Jeffy then resumed living with Mario and continued to cause much trouble around the house.
Jeffy is somewhat different than the average teen, with a tall posture. He wears a blue bicycle helmet (with black messy hair under it), usually has a pencil shoved up his nose, has blue crossed eyes, along with a yellow T-shirt that reads "Jeffy" on it which his mother wrote so he whould 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 a point of losing 100,000,000 dollars because of it.
He wears short dark blue jeans with a 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. His biological appearance seems to be mixed between his parents, with his blue eyes inherited from his mother and his dark brown hair inherited from his father. His face is oval-shaped with two teeth and around the nose, along with two eyelashes and a unibrow.
Starting off as a mentally-challenged baby-like kid before evolving into a slightly ditzy person who swears like a sailor, explodes in anger at any slight against him, and knowing a lot about perverted acts for someone his age, Jeffy's personality has gone through more changes than any other character. Over time, he has matured and does not annoy Mario and Rosalina as much as he used to. He barely swears any more 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.
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 "retard", he tends to have a breakdown by throwing his head 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 assigned a 10-page essay that was due the next day and cusses (mostly the F-word) at Jackie Chu, saying "ARE YOU F**KING 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 likes to put his "pee-pee" in various objects, especially Cheerios boxes, to the point where he even impregnates one and develops romantic feelings for it.
He is also afraid of trivial and ridiculous things, such as animals, toilets, snow, ostriches, a flu shot, and the number 7. Based on characteristics, it is suggested that he has mental retardation. His mother delivered him to Mario because she did not love him for unknown reasons (according to Jeffy).
Despite suffering from mental retardation, Jeffy has shown traits of intelligence, but in a dumb 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. He is also an extremely skilled painter, a trait passed down from his father.
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, 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 retarded. 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 battle the evil 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.
Jeffy has proven to be the most controversial character of SuperMarioLogan. Many fans complained about him by saying that he was offensive, due to him being a stereotype of mentally disabled people. Logan has responded to these claims by saying that Jeffy is meant to be funny like Chef Poo Poo, not mentally disabled.
Since Jeffy's Bad Word! and Locked Out was released, Jeffy received an immense hatred from older fans, because of him saying the word "f***ot" and being an absolute jerk towards Mario. Despite this, he is also known to have a diehard fanbase, which consists of young children and teenagers, adding even more controversy. After Jeffy's Parents!, fans started to sympathize and like him even more as he had been abused by his mother, Nancy.
Jeffy's popularity grew when Jeffy The Rapper! and Jeffy's Fidget Spinner! was released, which made many young children grow fond of Jeffy and basically worship him. Later, the children constantly demanded more videos featuring him and would dislike any video that does not feature him. This caused many older fans to fuel their hatred for both Jeffy and his fanbase. In Jeffy's Fun Day!, he received a poor reception.
In December 2017, a seven-year-old boy attempted to hang himself with a noose the way Jeffy almost did in his emo form in the now-deleted Jeffy's Tantrum!. The mother of the child discovered this and reported in the news station called The Sun after he attempted to do the act. 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, second-graders and third-graders watched Jeffy The Rapper! and were disciplined after mimicking him(mostly by boys).
As of late 2018 and early 2019, SML lost some of his viewers due to the fact that Jeffy became incredibly overused and popular with young children, even though his actions and language are inappropriate for their age. However now that jeffy doesn’t swear or act inappropriately anymore no one seems to hate him as much.
- "ARE YOU FUCKING HIGH?!?!"
- "What doing?"
- "You said Jeffy's a bad boy?!"
- "It slipped."
- "I don't even know."
- "I HATE GREEN BEANS DADDY!”
- "Why you do that?"
- "The new SML store is now open, so go check it out at SML Merch.com!"
- "My name is Jeffy, see? It says it on my shirt, Jeffy."
- "HOW HIGH ARE YOU?!?!"
- "I don’t have to."
- "I don’t like it."
- "That's so, PP!"
- "Daddy, you're high as fuck!"
- “I love you!”
- "DADDY, ARE YOU FUCKING HIGH!?!"
- "DADDY, YOUR AS HIGH AS A KITE"
- "I wanna be a moose. All moose-fuck."
- "DADDY- DADDY, that is not fair..."
- ”Daddy, I didn’t start anything! I’m a perfect angle~!”
- ”I don’t want to.”
- ”I don’t want you to.”
- "Listen here motherfucker! If you throw another goddamn paper ball at me, I will fuck your shit up! I am not to be fucked with."
- I wanna play with the moose's’s. The moose! The moose!
- Yay we did it, let’s party up tonight!
- ”Well daddy, I done s**t myself! My pants are all full of f**k.”
Likes and Dislikes
- Pooping in his pants
- Marshmallows on pancakes
- Playing his Cat Piano
- Annoying Mario
- Cheerios Box (love interest)
- Jacques Pierre François (most likely)
- Britknee (formerly, ex-girlfriend)
- Prank calls
- Pokemon Cards
- Fortnite (His favorite video game)
- Magic Tricks
- Board Games
- Spanking his diaper
- Nintendo Switch
- Foster's Home For Imaginary Friends
- Saying the word "F****t" (in Jeffy's Bad Word!)
- Making a grunt noise
- The Bunny Do song (Hop Hop)
- Throwing stuff
- Jumping (on beds, trampolines, etc.)
- Kicking everyone out of the house
- Chocolate cake
- HIT Entertainment
- Showing people his "pee-pee"
- His Pooperman shirt
- Black tar heroin
- Fidget Spinners
- Indiana Jones
- Pretending to be The Poop Monster
- Saying curse words
- Putting barbecue sauce on chicken nuggets
- Making animal noises
- Dropping the F-bomb on people (especially Mario)
- Giving his pets vulgar names
- Melvin (Pee Pee Suck II/Poop Butt)
- His Giant Inflatable Duck
- Peeing on Mario
- His chop saw
- Mashed Potatoes
- Black Yoshi
- Painting on the fence
- SpongeBob Moves In App (In Jeffy's Tantrum!)
- SpongeBob (his favorite show)
- His iPad
- His iPhone
- Destroying green beans
- Slapping women
- Chicken Nuggets
- French Fries
- Throwing cartons of milk, saying that they slipped
- Mickey Mouse
- Chef Pee Pee
- Roast beef
- Pizza Hut
- Beating his meat
- His drawing self
- Toys R Us
- Ice Cream
- Froot Loops
- Lucky Charms
- Poopy Butt (Formerly named: Shitass)
- Watching YouTube
- Jeffy Junior
- Five Nights At Freddy's (In Robot Jeffy)
- His Pokemon card, Politoed EX
- Taco Bell
- Rocket League
- Dudely Awesome
- Hershey's chocolate syrup
- Jimmy John's
- String Cheese on his green beans
- Beating up Bully Bill
- Bumble Bee Shoes
- Video games
- Chuck E Cheese's (Which he thinks it's Disney World)
- Pepperoni pizza
- Green bean pizza (More so than pepperoni pizza)
- Being expelled from his school
- Lifesavers (candy)
- Vanilla ice cream
- Diet Coke
- Peanut butter & jelly sandwiches
- Corn (in Jeffy's Nanny!)
- Picture of a finger
- Beary (his teddy bear)
- Cheese pizza
- Chocolate ice cream
- SpongeBob toys
- Fortnite piñata
- Fortnite toys
- His Spider-Man mask
- His toy Lightsaber
- Patting his diaper
- Toilet Paper Blaster
- Gummy Worms
- His backpack with his face on it
- His Minecraft backpack (formerly)
- His red Crayola toothbrush
- His Batman action figure
- His Mr. Potato Head toy
- Minion playing guitar toy
- Swimming in the toilet
- Mickey and the Roadster Racers
- South Park
- Disney World
- Splash Mountain
- Doing dangerous stunts
- Destroying green beans
- Tigers (especially his pet tiger)
- Submarine Man songs
- The Fairly Oddparents
- Orange Zebra
- Being nice
- Roast beef
- Green Beans
- Cody saying that 2 can fit in 10, 3 in 6
- Being called a "bad boy"
- Animals (formerly)
- The Ticket Blaster (in Jeffy's Birthday!)
- The Bunny Do stopping
- Jeff The Killer
- Pieces of gum
- Gummy worms (formerly)
- Getting the flu
- Flu shots
- Being and getting grounded
- His shirt running away from him
- Getting underpaid for his teeth
- His helmet running away from him
- Nazi Cheeseburger
- Nancy (his abusive mom)
- Evil Bathwater Bubbles
- Taking a bath or shower
- Balloons popping
- His haters
- Luigi sucking him in Ghost Jeffy! (possibly)
- Dead Bodies
- People stealing his money
- Bully Bill
- Being called a retard
- Bullies not following the Anti-Bullying rules
- Losing his pencil
- Breaking his helmet
- The moon
- Mario hating his rap song
- Craig the Devil in his Nanny form
- Creepers (Minecraft)
- Coal (which he mistakes for elephant poop in Jeffy's Bad Christmas)
- His bicycle being taken away from him
- Having a toy taken away from him
- Jeffy Junior misbehaving
- Getting detention
- Scary Bunny
- Taco Bomb
- Tic Tacs (his allergy)
- Spiders (Minecraft)
- Having no Wi-Fi
- His helmet (In Jeffy's Switcheroo!)
- Summer school
- Military School (possibly)
- Being expelled (in Robot Jeffy)
- Getting ‘raped’ (in Jeffy's Bad Word!)
- The number 7 (in Jeffy's Biggest Fear!)
- Pepperoni pizza
- Green bean pizza (More so than pepperoni pizza)
- Getting more homework
- Vanilla ice cream
- Diet Coke (Because it has "die" in it)
- Broccoli (just like Junior)
- Peanut butter & jelly sandwiches (Calls it "Peanut-poop and jelly-ass sandwiches")
- Corn (in Jeffy's Nanny!)
- Lifesavers (possibly)
- Makes Bad Decisions Guy
- His Minecraft backpack
- Minecraft zombies
- Baby arugula
- Boofy the Moose
- Candy corn
- Atso (formerly)
- Rule 34
- Being evil
Jeffy has been known to commit crimes. Being over the age of being arrested, these crimes could land him in jail. He has committed 19 crimes. He has committed more crimes than Black Yoshi.
Assault: In Jeffy The Rapper!, he smacks a woman and in Jeffy's Bad Christmas, he attacked Brooklyn T. Guy who was disguised as Santa Claus, along with punching Santa Claus constantly. In First Day Of School and Substitute Teacher! he threw random stuff at Jackie Chu and Mrs. Nutkiss. Jeffy's Imaginary Friend! He threw a chair at Jackie Chu. In Invisible Jeffy! He knocks out Jackie Chu. He beats up Bully Bill a lot if he insults him. As a baby, he beats up Brooklyn Guy after he threatened to hurt him in Baby Jeffy!
Grievous Bodily Harm: Jeffy often beats up Bully Bill, normally leaving him critically injured in many casts and bandages with broken arms and black eyes. In Jeffy Goes Bowling!, he broke Rosalina's arm with a hammer while he was playing “Pin the Tail on the Donkey“ while blind. He does the same to Mario during the end of the episode. In Baby Jeffy!, he injured Brooklyn Guy with his giant rock and stack rings when he gets badly injured after fighting.
Lying: Although it's not necessarily a crime, in Jeffy's Lie!, he told a false story to the whole class about defending Godzilla after he saved 45 babies inside a hospital which was on fire. Later it turned out to be real on the news. He refused to do it for real.
Impersonating: In Doctor Jeffy! he wore a fake doctor’s outfit.
Sexual Assault: In Invisible Jeffy!, he spanks 6 girls on their rear ends at the Pensacola Beach.
Filing a false report: In Jeffy's Bad Word!, he lied to everybody including the news and the cops that Mario raped him when all Mario did was spank him when he wasn't listening. In Jeffy's Foster Home!, he lies to Brooklyn Guy about Mario beating him up, locking him in a coffin full of rattlesnakes, and forcing him to eat wet toilet paper when all Mario did was slap him on his hand.
Child Abuse: In Jeffy Has Kids!, he spanked and flushed his son Jeffy Junior down the toilet. And in The Baby Project!, he electrocutes the baby, throws it around, shoots it and burns it, turning it into ash.
Attempted Murder: He knocked out Black Yoshi with a vacuum cleaner in Black Yoshi's Chicken Sandwich! Along with that, in Jeffy's Backpack!, he attempted to vaporize Bully Bill with the lasers on his backpack.
Theft: As mentioned in Jeffy The Rapper!, he opens up someone's mail. In Jeffy The Rapper 2, he stole some of the prize money. He also stole a Lego man from Walmart in The Watch!. In Invisible Jeffy! he steals a sandwich at Jimmy John's an employee was making and he also stole Goodman's money while he was searching for his wallet, causing Jeffy to be shot in the abdomen. In Rich Mario!, he stole one of Goodman's gold bars. Also, in Jeffy’s Scooter! he stole Scooter’s scooter (it was actually Richard’s scooter).
Vandalism/Criminal Damage: Jeffy smashed Black Yoshi's Xbox One off the balcony although it was a dream in Jeffy’s Mistake, the Switch console in Nintendo Switch, shattered the dishes Mario made him wash in Jeffy’s Wi-Fi Problem, destroyed the TV three times: Jeffy's Tantrum!, Jeffy Gets Hypnotized!, and Jeffy The Psychic!, and he destroyed and messed up Bowser Junior’s Politoed EX card in Jeffy’s Pokemon Card!. He also destroyed the lamp, and a cup with a bat in Jeffy Plays Minecraft!. In Jeffy Plays Fortnite!, he rage-quits and smashes the keyboard and monitor because he was so close to getting a victory royale. He also destroyed the “Don’t Wake Daddy“ board game in Bowser Junior's Game Night 4 where he accidentally woke him up. In Jeffy's Bad Christmas, he rages over getting coal and throws the Christmas tree outside causing some of the ornaments to break and the tree to possibly break apart. Also, in Jeffy’s Scooter! he broke Scooter’s scooter (it was actually Richard’s scooter).
Poaching: In Jeffy's Pet Shark! he caught a baby shark named Sharky and keeps it as a pet until Mario told him to return it to the beach. In Jeffy’s Pet Tiger, he brought a wild tiger into the house when Mario wouldn’t let him buy one for $2000.
Credit Card Fraud: In Mr. Goodman's Credit Card!, he used Goodman's credit card to purchase $10,000 worth of v-bucks in Fortnite without Goodman's knowledge.
Prank Calling: In Jeffy’s Cellphone, he prank calls 911, Domino's, And Pizza Hut.
Driving Without Driver's License: In Goodman's Son Gets a Job!, he drove Mario's car to McDonald's because Mario refused to get him a Happy Meal. In Florida, he's old enough to have a driver's license, but he should have received it before the Cough cough/Coronavirus started.
Jeffy's Mistake! (dream only) (Blown Up by Black Yoshi)
Jeffy Gets Stung By A Bee! (revived after being turned into a banana)
Jeffy Has Hiccups! (Mario's imagination only) (Holding Breath for too long)
Jeffy's Taco Tuesday! (Off-screen; Threw explosive tacos on the couch, killing himself, Mario, and Cody)
Jeffy's Energy Drink! (Heart failure; Revived)
Ghost Jeffy! (revived) (choked on Life Savers candy)
Forms and Variations
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 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.
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!, and Jeffy The Rapper 2.
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 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.
- 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.
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!.
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!.
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.
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.
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 was 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 liked to say "hey fat boy, wanna fight?".
Baby JeffyIn the episode Baby Jeffy!, Jeffy drank too much youth juice, turning him into a baby. Baby Jeffy. Finish this please
Old JeffyIn 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.
MarioMario is Jeffy's adoptive father. Mario has a strong dislike of Jeffy, but deep down, he actually cares about him, as confirmed in Jeffy's Parents! Jeffy likes Mario and usually calls Mario "Daddy." Mario finally adopted Jeffy after a year in Jeffy's Parents!. Mario was incredibly unhappy that Jeffy was dropped off at his apartment door and loathes the fact he has custody of Jeffy. Mario gets frustrated with nearly every video they appear in together. Most of the time, however, it seems that Jeffy annoys Mario, not on purpose. Mario had tried multiple times to get rid of Jeffy, but to no avail. Most of his attempts ended with Jeffy back at Mario's step or in the case of Where's Jeffy?, Mario going back to get Jeffy because he had Rosalina's necklace, only to find out that gave it to a squirrel. In Bowser Junior's Nerf War!, both Mario and Jeffy even made a small cameo appearance right at the end and Mario attacked Jeffy with a Nerf gun. Jeffy gets Mario into trouble often. Mario used to hate Jeffy in earlier episodes, but in later episodes, he deep down loves him, except for his stupidity. Although Mario gets annoyed with Jeffy most of the time, he has been shown to care about Jeffy, as shown in Jeffy's Mistake! when Black Yoshi was about to kill Jeffy; in Rosalina's Parents!, Mario gets scared when he assumes Jeffy fell to his death and freaks out when Jeffy gets abducted. It's possible Mario might only care just so Rosalina won't break up with him. Despite all this, they deep down love each other.
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! 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.
Debuting in Jeffy's Parents!, Nancy is shown to be very abusive towards her son, to a much higher extent than Mario was. 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.
Jeffy and Rosalina seem to get along well, going to where Rosalinat copies Jeffy a lot. Jeffy 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.
Jacques Pierre François
Not much is known about Jeffy's relationship with his dad, world-renowned French painter Jacques Pierre François, who had passed away after committing suicide in pursuit of his art. 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.
In Jeffy's Sister!, it was revealed that Jeffy has a 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 sister Feebee was killed when she got hit by a truck while riding a bike and died back in 2015.
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.
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 was would've killed Jeffy if Mario hadn't showed up in time.
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.
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 on the bathroom with the toilet clogged.
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.
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.
Jeffy and Bowser don't seem to have a good relationship due to how Bowser accidently giving Jeffy the flu by coughing in his mouth in Jeffy's Flu Shot! and how Bowser acted harshly towards Jeffy in The Competition! He also doesn’t like the fact that he beats junior when he annoys him. Jeffy, however, did congratulate Bowser when he won Charleyyy's underwear in Jeffy and Junior's Big Heist!.
Abilities / Super Powers
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.
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.
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 Evelina (Eva Gronowitz) from Beacon Art Studios. It can be found on her Etsy website and costs $513.00 USD.
- Logan said in multiple videos that Jeffy was originally going to a side 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 anymore, which upset many older fans and causing them to hate Jeffy.
- 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.
- Jeffy appeared in Jeffy Plays Baseball!, confirming he was neither “axed” or put on a hiatus.
- 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.
- Lance's Character Q&A video reveals a few things about Jeffy.
- His favorite foods are carrots and chocolate cake. He also likes pancakes with marshmallows.
- 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! you can see him laughing with Junior when he put on his name card "Poopy Butt" 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 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 likes mashed potatoes.
- Jeffy's full name, Jeffy Jeffy, is a reference to Mario's full name, Mario Mario
- It has not been confirmed if Jeffy suffers from a mentally disability and/or retardation.
- He is, however, implied to have Down syndrome, as stated in Bowser Junior Kinda Goes Camping!, when he says "I'm down... syndrome."
- 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 retarded.
- Jeffy's personality is similar to that of Cirno from the Touhou franchise, in which both characters are somewhat childish.
- 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 and 9+3=93.
- 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 in Where's Jeffy?.
- Jeffy has many different poses in the videos' custom thumbnails.
- The song that is used for when he is on-screen is called Doh De Oh by Kevin MacLeod.
- In Jeffy's Birthday!, it is 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 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).
- From September 22, 2016 until September 27, 2016, SML was selling T-shirts for $19.99 USD and $26.11 CAD.
- 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 15 years old, it could be possible Jeffy has been held back 6 or 7 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. 
- 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.
- In Jeffy's Bathtime!, it is 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 has later stopped doing this.
- In his first appearance, his voice sounded way more different than his new recent voice from April 2016.
- 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!.
- 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. 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.
- 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 may be zoophilic.
- 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, they already had Doofy The Dragon, so they ended up with naming him Jeffy.
- He was originally going to be voiced by Chris but due to him voicing Brooklyn T. Guy he couldn't voice Jeffy since it would be hard for him.
- Jeffy was actually supposed to have a red helmet but it never happened.
- 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.
- 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 color is a carrot as revealed in Lance's Character Q&A video.
- Jeffy's favorite character on Spongebob Squarepants is Patrick. However, he believes that Patrick is Squidward.
- Jeffy's way of understanding people is the opposite of his objective.
- Jeffy is a fan of Naruto.
- Jeffy and Goodman both curse frequently.
- Coincidentally, both characters are voiced by Lance.
- Jeffy can look both ways at the same time when crossing the street since he is cross-eyed.
- 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 brain cancer.
- Jeffy has admitted that even though his name is written on his shirt, he still forgets his name sometimes.
- 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.
- It's revealed in Jeffy's Parents!, that Jeffy was born in Paris, France.
- Jeffy's catchphrase "ARE YOU F--KING High!" could be inspired by the 2008 comedy movie Step Brothers. The movie is about two step brothers named Brennen and Dale who are adults but act like there little kids, in one scene Brennen and Dale's parents ground them by not letting them watch TV for a week after the two get into a fight witch made Brennen mad and shout "ARE YOU F--KING HIGH!"
- in Jeffy's Lie!, he is shown to turn off his ears and pretends he cant hear anything in a form of ignoring people.
- Jeffy has worn the most costumes out of any character on SML
- 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 is because of COPPA and Logan not wanting his channel to be shut down or his videos getting demonetized.
The "Fate" of Jeffy
It has been confirmed by Logan in a Chilly vlog that when SuperMarioLogan gets ads back, he would make a video where he burns the Jeffy puppet outside because of all the trouble he's caused to both SuperMarioLogan and SuperLuigiLogan, (and to himself in general) and will even kill the character off. He's also stated that when he gets ads back, he'd upload the long-awaited SuperMarioLogan Movie and will upload Bowser Junior and other characters’ videos.
This however was later confirmed to be just a joke. And Logan has keep saying many times that he will kill off Jeffy but he always jokes about it, which means Jeffy is still alive.
Logan has released merch with most of them being Jeffy related, like the Jeffy phonecase, Jeffy T-shirt ,and the newly added most wanted bto bethe 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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- ↑ Jeffy The Rapper! (https://www.youtube.com/watch?v=VF3N0pEIM2s )
- ↑ First Day Of School! (https://www.youtube.com/watch?v=wsPA_yOq-iU )
- ↑ The Fender Bender! (https://www.youtube.com/watch?v=y0tvZTR1ar8 )
- ↑ Jeffy Gets a Job! (https://www.youtube.com/watch?v=sCJVUFW-dpY )
- ↑ https://www.youtube.com/watch?v=6O2184Q2wFY
- ↑ Jeffy gets adopted by Mario in Jeffy's Parents!.
- ↑ Rosalina marries Mario in Mario's New Hat!
- ↑ Substitute Teacher!
- ↑ https://en.touhouwiki.net/wiki/Cirno#Personality
- ↑ https://youtu.be/5LMuUaBevuE "Jeffy’s Summer School"SuperLuigiLogan. YouTube Jul 4, 2018.
- ↑ See https://www.youtube.com/watch?v=aaW9vUwEJyY and https://www.youtube.com/watch?v=pX6vby0AEoM
- ↑ "Logan Reacts: Mario The Babysitter!" SuperLuigiLogan. YouTube. March 7, 2018.
- ↑ Jeffy Gets Help!
- ↑ Jeffy's Imaginary Friend!
- ↑ Jeffy's Birthday Surprise!
- ↑ Jeffy Loses His Pencil!
- ↑ Jeffy The Psychic!
- ↑ "Logan Won’t Burn Jeffy Unless " Chilly. YouTube. July 14, 2018.