spongebob squarepants, captain underpants
Baby Huey perhaps, one of the most infantile and moronic. he used to use the catch-phrase, always chanted at the end of an episode: I"m A Mental Retard!
Fearless Fly ,
The Milkybar Kid? Desperate Dan? Um... Woody?
The only on I can think of it the Hamburglar.
Cartoon Network Punch Time Explosion Monkey Trailer
Cartoon Network Punch Time Explosion Grim Trailer
Cartoon Network Punch Time Explosion "Buttercup" Trailer
Cartoon Network Punch Time Explosion Captain Knuckles Trailer