Wario

Wario is rude, selfish and bullying - certainly not qualities associated with traditional heroes and indeed Wario is a borderline villain (sometimes going full-scall antagonist): for the most part however Wario has been altered from a threat to a comedic nuisance who has actually become a hero of sorts in his own franchise (albeit a very greedy and flawed one).

Wario has even saved the world on numerous occassions, though it is normally done out of his love for gold and fame than for any true care about the world's safety (Wario is not completely heartless though, just a bit of an egomaniac).