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Jeffy Jeffy François, is a student at Y U DUMB? Elementary School, and the adoptive son of Mario and Rosalina. Jeffy is the biological son of the painter Jacques Pierre François and Nancy. During his childhood, Jeffy suffered abuse, lack of parenting and education and trauma as he lost his sister at a young age.

Jeffy was first revealed in Mario the Babysitter! with absolutely no memory of what he went through during his childhood. Overtime, Mario would develop hatred against Jeffy for all the stress and trouble he has caused him. Jeffy acts like a mentally disabled kid for three reasons; his mother was very drunk during her pregnancy with him. He was never enrolled in a school due to lack of responsibility; he was always beaten by his biological mother.

Jeffy was then put on a two-month hiatus for an undisclosed reason, returning in Bowser Junior's Game Night 3. Meeting Junior for the first time and developing a good relationship with him along with Joseph and Cody, who later becomes best friends within the future.

In attempt to put an end to Jeffy's existence. Mario hires a bounty hunter/hitman to kill him once and for all and to get him out of his life. Mario then lures Jeffy to the park with an ice cream cone but at the last minute, Jeffy threw the ice cream cone away leaving Patrick to die by accident.

Jeffy's behavior however is worse, as Mario was taking him to the store, Jeffy is rapidly saying the f word (f*ggot) in front of people. This causes Mario to react on impulse and beats Jeffy in front of Rosalina, this causes Jeffy to call the police and Mario is fired from Nintendo, and he is known to the world as the "Worst Parent Ever".

In 2017, the truth about Jeffy is revealed as in "Jeffy's Parents!" Mario gets a call from the office explaining that they found Jeffy's biological mother and he is taken away. Mario excited, Rosalina decides to break up with him. Jeffy then escapes from the grasp of his mother and runs back to Mario's house. Learning where he came from, resisting Nancy's wrath. Mario calls the police and has Nancy arrested, Brooklyn Guy comes back with a note saying that Jacques Pierre François was his biological father, realizing that he was a famous painter who made millions of money deemed that Jeffy will inherit the money his father made on Sunday, August 21, 2022.

Jeffy then promises that he will be a good boy and he wants to stay with Mario to avoid being placed in a foster home. Mario and Jeffy decide to start their first episode as a official Father and Son as Mario decided to adopt him officially.

Set a few months after "The New House!". Jeffy was playing Hide and Seek with Mario and Rosalina. And Jeffy was overhearing knocking/banging from the Secret Door and opened the door to be traumatized to twenty-six dead bodies, about to be killed by Does Bad Things Guy, they were then rescued by Brooklyn T. Guy revealing that he was on vacation for seven-months.

He is the oldest child of Nancy and Jacques Pierre François, and the older brother of Feebee and his adopted clone brother Scooter, but since his biological father Jacques died and Nancy was arrested he and Scooter are now the adoptive children of Mario and his wife, Rosalina.[7][8] The things that he does in his everyday life is annoying and torturing Mario, hanging out with Junior and his friends, causing trouble, hating school, throwing a plate of green beans, eating chocolate cake and more.


Starting off as a mentally disabled 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 rarely 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.

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". 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 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, his archrival and most hated person in the world.

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 not being very smart, Jeffy has shown traits of intelligence, but in a retarded 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 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 are mostly due to his unintelligence. He has his fair share of good deeds that battle the evil ones, such as being considerate of to Hansel in three episodes. He is most likely misunderstood after suffering pain from his biological mother and witnessing his twin sister and biological father'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!".


Jeffy is somewhat different than the average teen, with a tall and slim 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 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. 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.


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Early Life

Troubled Childhood

Jeffy was born as Jeffy Jeffy François in a porta-potty at 7 Jeffy Street, Paris, France, on August 21, 2004, to prostitute Nancy Pierre François 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. His mother also forced him to stick a pencil in his nose for unknown reasons. He also lost his toes through an unknown incident. This was seen in "Jeffy Breaks His Leg!".

Jeffy moved to Florida in 2005 with Feebee, his little sister, who later died in a bike accident as Nancy took her helmet to use as an ashtray. Her death was the reason why Jeffy always wears his helmet wherever he goes.

Abandoned by Nancy

After Nancy had enough of his antics, Jeffy was dropped off at Mario and Bowser's apartment. 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.

The Death Of His Sister

In 2015, Jeffy was trying to teach Feebee how to ride a bike, and while Feebee was not good at it, she never gave up and kept trying, but due to Nancy using her helmet as a tray. Feebee was unable to survive being hit by a truck going at least 60 MPH. Jeffy horrified after the death of his sister, decided to keep his helmet on at all times.

Inheritance of his father's money

After his wealthy father committed 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.

Rapper Career

Inspired by what Tyrone has sung. Jeffy decides to become a rapper and instantly was successful but due to Tyrone's bad influence. Jeffy is convinced that because he is a rapper, he can start committing crimes to get more famous. He first assaults a woman, opens a mailbox and shoots a elder, earning him months in prison.

Toad over seeing how successful Jeffy has become decided to make a diss track on Jeffy, which quickly spreads word around the world. Jeffy intended to fire back but instead gets a message from Toad asking for him to step outside so they can finish this.

Jeffy walking outside at night trying to find Toad at the designated location he mentioned in the message is interrupted when Toad pulls up and shoots Jeffy mutiple times. Luckly Jeffy survived his wounds and decided to not be a rapper anymore.

The Cloning Situation

Jeffy currently has two clones. Drawing Jeffy and Scooter. During 2018, Mario and Rosalina constantly fall for the switch with Jeffy and Drawing Jeffy. In "Jeffy's Clone!". Jeffy is cloned by Bowser Junior and Cody by the C-C-Cloning Machine.

Scooter is currently lurking outside Mario's house and it is unknown if he is still alive or not. He is very well presumably deceased, and Jeffy and Mario haven't heard of mentioned from him since his last appearance in "Rich Scooter!".

The Christmas Crisis

During "Jeffy's Bad Christmas". Jeffy is greeted to only one present on Christmas morning and it is full of coal revealing that Jeffy did not make it on Santa's nice list. Jeffy reacting on impulse throws the tree outside destroying it.

Jeffy then meets up with Junior and Cody and turns out Cody has a device that can bring Santa to their reality. Jeffy at first knocks out Santa without context. Next, Jeffy is convinced by Santa that he will not run the next time but somehow, he teleported to the front of the house and knocked out Santa yet again.

The final time, Santa finally comes up with a master trick and tricks Jeffy, Junior and Cody that if they turn around and count to 10, they will each get as many presents as they want. The trio falls for this and Santa makes his great escape. Jeffy saddened that he will not get any presents this year. Junior decides to give him one of his presents.


Magenta and White Bicycle (formerly)
Blue Bicycle with Thomas the Tank Engine (Jeffy's Coma!)


  • "Why?"
  • "UH!"
  • "ARE YOU F***ING HIGH?!?!"
  • "Hey Daddy. What doing?"
  • "You said Jeffy's a bad boy?!"
  • "Whoops."
  • "Moose f***!"
  • "I don't even know."
  • "Why would you do that?"
  • "My name is Jeffy, see? It says it on my shirt, Jef-fy."
  • "¡Si papi, yo quiero mas papi!"
  • "Bep!"
  • "I don’t have to."
  • "I don’t like it."
  • "That's so, PP!"
  • "Daddy, you're high as fuck!"
  • "PAPER!"
  • ”DADDY!!!”
  • ”I don’t want to.”
  • ”I don’t want you to.”
  • "I'm here, f***ers!"
  • "It slipped, Daddy."
  • "The new SML store is now open, so go check it out at SML!"
  • "HOW HIGH ARE YOU?!?!"
  • “I love you!”
  • "Good."
  • ”Daddy, I didn’t start anything! I’m a perfect angel~”
  • "I wanna be a moose. All moose-f***."
  • "DADDY- DADDY, that is not fair..."
  • "Doodle Doodle Pencil Fart."
  • "Listen here m*****f*****! If you throw another g****** paper ball at me, I will f*** your s*** up! I am not to be f***ed with."
  • ”Well I done s*** myself, daddy! My pants are all full of f***.”
  • "Booty, b*****s, and bacon."
  • "Well, toot-toot f*** s***!"
  • "Toot-toot pencil fart!"
  • "But daddy..."
  • "Squeakity, squeak squeak squeakity, squeaker..."
  • "That is the tits."
  • "Balloon tits!"
  • "Awww give me some pizza Daddy!!!"
  • "My daddy is the Tooth Fairy!"
  • "I got a pretty cool daddy!"
  • "It's a pee pee Daddy!"
  • ”Thanks for caring daddy.”
  • ”I’m gonna spend this 100$ dollars on Fortnite Vbucks!”
  • ”Hi Uncle Luigi!”
  • "AWW, DADDY!"

Death Count

Forms and Variations

Sick Jeffy

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. This form of Jeffy is missing his diaper, and is wearing a red fedora, a sweater vest, pale brown/green shorts, and his socks and sneakers.



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" and "Precious's Biggest Fan!".

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.

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 the episode, Jeffy drank too much youth juice, turning him into a baby. Baby Jeffy starts fighting against Brooklyn Guy and beats him up. This is also the only form of Jeffy that has toes. He returned in "Jeffy Ball Z", where he was chosen by Jeffy to use Thunderbolt on Cody.

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.

A similar form appeared in "The Zombie Apocalypse!" when Jeffy ate radioactive candy. He ate Junior and Cody.



Before Season 9, Mario and Jeffy formerly had bad blood against each other. Mario also hates his stupidity and how he can 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.

Jeffy with Mario

However. in the episode Jeffy's Parents!, it showed Mario's good side on Jeffy and 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 . After learning 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: Neutral

Bowser Junior

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. 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.

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 find's Jeffy attractive.

Status: Neutral


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.

Nancy then returned in "Jeffy and Junior Go To Prison!". Jeffy was placed in a cell with her, and Nancy threatens him that she is going to kill him and get her money. Jeffy then corrected her saying instead of serving a few years. She will serve life in prison as Nancy does not have custody of Jeffy anymore as of 2017.

Nancy returned once again in "Jeffy's 17th Birthday!" and breaks out of jail. She tracks down Jeffy at his house and knocks out Mario and holds him at gunpoint where Brooklyn Guy tried to reason with her. Guy then explained that he was only turning 17 and that he would receive his money next year and Nacy then realizes her mistakes and comes willingly promising that she will break out next year.

Status: Enemies


Jeffy and Rosalina seem to get along well, going to where Rosalina 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.

Status: Neutral

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.

Status: Unknown


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.

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

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.

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.

Status: Enemies


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

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: Enemies


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

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 b**ch. Although the two hated each other all the time, but on extremely rare occasions, they kinda 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.

Status: Archenemies

Abilities / Superpowers

Magic Pencil

The pencil Jeffy has in his nose is possibly magical, he was able to make drawings drawn by his pencil come to life by saying "doodle doodle pencil fart" and he was able to turn anything into whatever he wanted when he put glitter on his pencil.


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.

Mild fourth wall break

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.

High Strength

Jeffy is one of the strongest characters in the SuperMarioLogan franchise, so is Bully Bill. But that does not stop Jeffy from handing Bully Bill's ass to him and beat up Brooklyn T. Guy even as a Baby. In Jeffy the Boxer!, he knocked out D-Money, a once undefeated world champion boxer with a mere two punches. He has also carried many objects much bigger than him such as their home couch and big home tv,s

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 Evelina (Eva Gronowitz) from Beacon Art Studios. It can be found on her Etsy website and costs $513.00 USD.
  • Jeffy has had five birthdays since he was taken in by Mario, making him 17 due to his age being revealed in "Jeffy's Parents!" when Brooklyn T. Guy read the note with Jeffy's information.
  • 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 voiced by Chris but due to him voicing Brooklyn T. Guy he couldn't voice Jeffy since it would be hard for him to voice two characters in one scene.
    • Revealed in Meet the Cast: Lance, Jeffy was actually supposed to have a red helmet, but it never happened but in a video his helmet was recoloured red for a few minutes.
      • Dabhdude once included this in his SML Iceberg, but was clueless to what the entry was on about.
    • Jeffy’s eyes were originally far apart, but due to him looking like a snake they brought his eyes closer.
    • 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.
      • This specific puppet can also be found on Evelina's Etsy page, under the title, "Sam the Puppet" which would reveal 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 and chocolate cake. He also likes pancakes with marshmallows.[9]
    • 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 its 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.
  • Logan has many stunt doubles for Jeffy along with any other characters.
    • 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.
  • 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 is similar to Leland Powell from Oh Shiitake Mushrooms., and they have even made a video centered around the two teaming together.
  • 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 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.
  • 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 is "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 has the same birth date as Brooklyn T. Guy and Hansel.
  • 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 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. [10]
  • 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 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!".
    • From that episode until now, Jeffy looks a bit different.
  • Jeffy turned 13 on the same day of The Great American Eclipse.
  • 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 is now one of the most common characters in all of SML.
  • 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.[11] 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.[12]
  • As announced in a Chilly vlog, Logan might not make Jeffy in SML videos anymore, that is until "Jeffy Plays Baseball!" was uploaded.
  • 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.
  • This was speculated that Jeffy was an inspiration of older characters like 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.[13]
  • Jeffy's way of understanding people is the opposite of his objective.
  • Jeffy is a fan of Naruto.[14]
  • Jeffy can look both ways at the same time when crossing the street since he is cross-eyed.[15]
  • 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.[16]
  • 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.[17]
  • 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 can't hear anything in a form of ignoring people.
  • Jeffy has worn the most costumes out of any character on SML, with around 70 costumes.
  • According to Jeffy's Anger Management, Jeffy's weight is 120 pounds, but at the time of the video he was 16, and his weight was around the weight of a 14 year old. It's truly unknown why he is this underweight, considering his love for sweets and junk food.


Logan has released merch with most of them being Jeffy related, like the Jeffy phonecase, 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.
Click this to check the website out ( Sus