Whopper is the second youngest member of the Pound Puppies who is always often fantasizing and imagining nearly impossible situations, and telling little white lies. He wears a diaper even though he is officially a "kid". Whopper also has a brother-sister relationship with Bright Eyes, as they often share opinions, come to agreements, and experience things together. 

He also dresses up in many different outfits as alter-egos during a heroic or otherwise serious situation, and provides comic relief. His most notable outfit and alter-ego is Wonder Whopper, in which Whopper wears a red cape and a blue bodysuit inspired by Superman. (NOTE: Has to sound EXACTLY like B.J. Ward's Whopper from the cartoon. He also has to be voiced by a female actress as well, as with the original show.)