Jeffy Jeffy François, (or simply referred to as Jeffy Or Jeffy Wilfred), is one of the main characters of the SML series. He is the adoptive son of Mario and Rosalina. The character was created by Logan Thirtyacre and Elaina Keyes and voiced by Lance Thirtyacre. He is the oldest child of Nancy and Jacques Pierre François, and the older brother of Feebee and Scooter, but since his biological father Jacques died and Nancy went to prison in "Jeffy's Parents!", he and Scooter are now the adoptive children of Mario and his wife, Rosalina.[6][7] Despite this, he still has his younger cloned brother, Scooter, who is currently wandering around outside Mario's house somewhere. He is the secondary antagonist of Season 8, and the main antagonist of many episodes like "Jeffy Sleepwalks!", "Jeffy's Tantrum!", "Chef Pee Pee the Babysitter!", "Jeffy's Wifi Problem!", "Jeffy Plays Fortnite!", "Black Yoshi's House Arrest!", "Jeffy's Punishment!", "Hurricane Jeffy!", "Locked Out", "Jeffy the Good Boy!", "Mr. Goodman's Egg!", "Jeffy Gets Ran Over!", "Jeffy's Good Day!", "Jeffy Gets Framed!", and his debut episode "Mario the Babysitter!". He is also the central antagonist of "Jeffy's Bad Word!" and "Jeffy's Yard Sale!". Despite being an antagonist in these episodes, he is the main protagonist of some SML episodes, such as "Detective Jeffy!", "Jeffy's Parents!", "Jeffy Gets Bullied!", "Jeffy's Big Idea!" and "Jeffy's Bad Christmas". In some episodes, he is deuteragonist and tritagonist to Mario in the Mario/Jeffy videos. Since his debut, Jeffy has proven to be very popular, most particularly with younger children. Despite his popularity, he has also caused much trouble and controversy and is overwhelmingly unpopular with many older SML fans. However, now that Jeffy has toned down his swearing and acting inappropriately, not as many fans seem to hate him as much and begin to enjoy him more. But that is not to say that people do not dislike him, as there are still some people who do.