He is a clone of Wario. He's basically a mini version of Wario as well. He is just as dumb, and doesn't follow rules. He stole Ronald McDonald's sign, and broke a law. He is so crazy he argued with himself, until he realized his other self wasn't real. He's pretty over powered, and beat the crap out of Cone Head and Yeti once for stealing money.
He believes the colors red and black are colors of evil. He insulted and attacked Batman due to his black suit. He does have a kind side and was willing to help Fire Mario attack Isabelle for her corruption. He has become more and more useful for Fire Mario, and was willing to attack Cone Head. It unfortunately failed, but it's the fact he was willing to try.