I have so many. Brohoof to all the other Gir fans out there, Patrick Star, Finn and Jake from Adventure Time, Dag from Angry Beavers, Rocko from Rocko's Modern Life, and most of all, Beast Boy from Teen Titans. My list goes on and on, but those are some of my favorites.
P.S. If anime counts...Death the Kid from Soul Eater is basically my idol...so much swag contained in one awesome package. He's followed a very close second by Sanji from One Piece.