Jeffy Jeffy François, or formerly known as Jeffy, is one of the main characters of the SuperMarioLogan series.

He is the adoptive son of Mario and Rosalina.

He is the main antagonist (alongside Springtrap) of the 2017 Part 1.

He is the secondary antagonist and turned anti-hero protagonist (alongside Springtrap) in 2017 Part 2.

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. 

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