Chum wears an orange and yellow uniform with white briefs worn outside his costume. In the pilot from Random! Cartoons, Chum Chum wears an orange collared shirt with yellow buttons on the chest instead of his logo. Voiced by Nika Futterman. In the pilot from Random! Cartoons, he was voiced by Nancy Cartwright. Supporting Boogregard "Boog" Shlizetti is a short-tempered bully who is obsessed with the video game Chimp Chomp (a parody of Donkey Kong), which he plays at the Frosty Mart, often instead of working. Boog's voice is a parody of John Travolta's "Vinnie Barbarino" character. Voiced by Jeff Bennett. Leonard "Lenny" Flynn-Boyle is the accident-prone junior manager of the Frosty Mart. He finds Fanboy and Chum Chum irritating and sometimes gets a "stress twitch" when annoyed by them. His first appearance was in "Dollar Day." Voiced by Wyatt Cenac. Kyle Bloodworth-Thomason is an insecure pre-teen wizard who loathes Fanboy and Chum Chum for their lack of intelligence, but secretly enjoys their friendship. Kyle was expelled from his wizarding school, Milkweed Academy, for turning his teacher Professor Flan into a raspberry flan, calling him a "Delicious old fool". Kyle is now reluctantly enrolled in Fanboy and Chum Chum's public school, where he has very few friends other than Fanboy and Chum Chum. Fanboy and Chum Chum typically forget that Kyle has wizardly powers, and the effort of reminding them usually infuriates Kyle. He wears a scarlet and yellow striped shirt with jeans. Kyle has red hair and very large front teeth with braces and he speaks in a British accent. As Kyle struggles to be re-admitted to Milkweed, he often suffers painful indignities, often a result of Fanboy and Chum Chum's actions. Voiced by Jamie Kennedy. Yo is another of Fanboy and Chum Chum's classmates. She is happy-go-lucky and loves her Yamaguchi (a parody of Tamagotchi) digital pets, especially a cat named Scampers. She has a rather insane crush on Chum Chum, and often wants to play with him like he's a toy. Yo has black hair, wears a yellow shirt, a plaid skirt, and a frog-shaped backpack. She is shown to be a talented prankster, dominating Fanboy on Prank Day. Though she can be villainous, she is normally nice. Voiced by Dyana Liu. Mr. Hank Mufflin is Fanboy and Chum Chum's grouchy yet often playful teacher. Voiced by Jeff Bennett. Ozwald "Oz" Harmounian is the owner of the