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Some of the characters on this wiki are not necessarily villains, just antagonists but their articles can stay.
~ Jeffy to Mario
Hey, you wanna see my pencil?
~ Jeffy's greeting
~ Jeffy's catchphrase
It slipped.
~ Jeffy's excuse for throwing such objects.
Jeffy François, also known by his known name Jeffy Jeffy, or simply 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 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 former SML member Anthony Miller.


Jeffy is dimwitted and likes to put pencils in his nose, putting his pee pee in stuff and spank his diaper. 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.


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 mother never cared for her, 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.


To be added


  • 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 is comfirmed that Jeffy's birthday is on August 21. However his real birthday might be different from this, but it's a placeholder for now in the SML series.
  • 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 apperance 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.
  • In Jeffy's Parents!, his age has been finally revealed, Jeffy is 13 years old, so he is speculated to have been born in 2004.





           SuperMarioLogan Villains

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Koopa Kids (SuperMarioLogan)

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