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Hey, you wanna see my pencil?
~ Jeffy's greeting
~ Jeffy's catchphrase
It slipped.
~ Jeffy's excuse for throwing such objects.

Jeffy (also known as Jeffy Jeffy) is a main character of SuperMarioLogan. Although he is not as nice a character as some may imagine - in fact throughout the course of the series, Jeffy appears to be very contested that everyone hated or get too annoyed: often this is due to his stupidity, but there have been times when Jeffy sometimes started off acting as an antagonist by torturing Mario while Mario gets annoyed and frustrated with him in almost every video that they appear in together, even though he could get rid of him. People have even suggested that Jeffy should go back with his real parents in a future SML video, getting rid of him permanently (a few have gone even far as to suggest killing him off).

He is also the main protagonist of the new School series and in the upcoming YouTube film The SuperMarioLogan Movie!. He was voiced by Lance Thirtyacre, Logan Thirtyacre's brother, while his chicken noise were provided by SML cast member Anthony Miller.

He is sometimes known as Jeffy François.


Jeffy is dimwitted and likes to put pencils in his nose, putting his pee pee in stuff and spank his diaper. In a vlog, Logan said that Jeffy will no longer hump stuff because he got age restricted twice. In Jeffy's Cellphone!, Jeffy calls a prostitute (which is revealed to be Britknee) while saying that his name his Mario. Britknee is seen by both Mario and Rosalina. Rosalina beats Mario up. In The first day of school, Jeffy asks Jackie Chu if he was high. Moments later, he knocked over his desk because he didn't want to do his homework.

He has shown to be somewhat of a pervert: in Jeffy's New Toy!, when Mario opens an email from Goodman, which is a porn video titled "Ass Pounders 2", Jeffy likes it and wants to watch it again, and in Jeffy's TV Show!, he says "Ass Pounders 3, here I come", meaning that he's ready to watch the next installment. In Jeffy's Home Alone!, he draw pictures of everyone with large breasts, even Mario.


Early life

Jeffy was born on August 21, 2004 in Paris, France to a famous French painter named Jacques Pierre François and a prostitute named Nancy at a portable toilet. His birth sign is Leo. His mother never cared for him, so it's a possibility if Jacques was the one who cared for him. He arrived in Pensacola, Florida as an illegal immigrant before he was forced to live in the apartments after Nancy has enough of his stupidity.


Hey wanna see my pencil. My name is Jeffy, see it says on my shirt. JEFF-Y!
~ Jeffy's first words
Hey. I'm a mummy.
~ Jeffy
Daddy, I pooped the bed. I pooped YOUR bed daddy.
~ Jeffy at the end of Jeffy's Mistake!
~ Jeffy's late 2016-mid 2017 catchphrase
Doodle, Doodle, [blank] fart!
~ Jeffy whenever he performs a magic trick





  • In the Pokémon series, Jeffy owns a Cookie Monster and taught it thunderbolt.
  • Where's Jeffy? is the first SML video that Jeffy is first seen without his helmet.
  • Jeffy' favorite foods are chocolate cake, chicken nuggets and pancakes with marshmallows.
  • His song is Doh De Oh by Kevin MacLeod.
  • In Jeffy's Birthday!, it was confirmed that Jeffy's birthday is on August 21.
  • The Jeffy puppet can be found on the Etsy website and it costs $500.
  • He is similar to I.R Baboon from I Am Weasel as both like to put stuff in their noses.
  • He bears a strikingly similar appearance to Special Ed from Crank Yankers, Jeffy from Donaldisthebest1's Jeffy from Nobody Cares, and Jeffy from Jeffy the Retard goes to 7-11 by wickedstudio505productions.
  • Jeffy is seen with his eyes bulging in Jeffy's Stupid Home Video!, Jeffy Sleepwalks!, Jeffy's Birthday!, Jeffy's Sister!, and Jeffy's Brain.
  • On September 22, 2016, SML was selling Jeffy t-shirts for $19.99 USD and $26.11 Canadian dollars until September 27 2016.


           SuperMarioLogan Villains

Big Red | Birdo | Black Yoshi | Blue | Boo | Bowser (Puppet) | Bowser | Bowser Junior (Puppet) | Bowser Junior | Brooklyn T. Guy | Bubbles (Lovell Stanton) | Bubbles (Wario) | Bullet Bill | Bully | Bully Bill | Bully Bill's Dad | Bitterman Carlito | CharlieBrown678 | Chica | Crack Bear | Craig the Devil | Crocodile Guy | Chompy | David Winkle | Dewey Donedidit | Diddy Kong | Dinosaur Bowser Junior | Does Bad Things Guy | Donkey Kong | Doofy the Dragon | Drawing Jeffy | Drug Dealer | Elmo | Evil Chef Pee Pee | Evil Cottonball | Fake Santa | Goodman | Goomba | Grarrl | Greg | Goofy | Giant Shrimpo | Hammer Bro | Helmet Pig | Joseph's Mother | Jeff the Killer | Jeffy | Jeffo | Joseph | Jorge the Drug Dealer | Kamek | Ken | Kidnapper | Killer Clown | King Pig | Koopa Troopa | Kyle Hoolahan | Killer Whale | Loan Dolphin | Mama Luigi | Mario | Mario (Jeffy's Mind) | Mario Clone | Mickey Mouse | Mine! Bird | Mojo Jojo | Mr. Pig | Mebo | Nancy | Nazi Cheeseburger | Nazi Robot | Other Killer Clown| Principal Steinbeck| Puppet Ken| Piranha Plant| Peach | Puppy | Quiggles | Robot Chef Pee Pee | Ringo | Rosalina (Jeffy's Mind) | Remy | Ray | Russian Spy | Shrek | Sharon | Sonic | Stinky | Screwball | Simmons| Shrek Junior | Shy Guy| Sheila Perkins| Scary Girl| Shrimpo | Sea Monster | Speedy| The Rat| Tyrone| Tyreese| The Squirrel| The Turkey| The Alien| The Nerd| The Crocodile| The Shark| The Killer Shrimpo| Tanner| Taliban| Tony| The Foreman Pig| The Other Shark| Thwomp| T-Rex| The Cat In The Hat| The Eagle | The Monster | The Money Thief | The Ouija Demon | The Seeker | The Robber | The Alien's Wife | Toad | Wario | Waluigi | Woody| Yoshi
Angry Birds | Koopa Kids | Pigs