Champ is a character from the film Mickey's Mechanical Man. He is a robot built by Mickey to compete with Beppo the Gorilla in a "Beast vs. Machine" wrestling match. Although he did not do so well in the fight, as he only managed to defeat the ape when Minnie's car horn blew, but afterwards he explodes.
In Epic Mickey
Champ appears in the projector screen levels based off Mickey's Mechanical Man. in them he is seen fighting Beppo.
Scene 1: He is losing the fight due to Beppo constantly uppercutting him.
Scene 2: He is now winning the battle by jumping on Beppo.