Wario used to be like that back in the day. I fondly remember his first game which was on the spinach GB. You went around beating the crap out of enemies and stealing their loot, and then at the end of the game there was like some treasure room with everything you stole. Since then his image has been toned down a lot with the WarioWare games and all that. He isn't as bad ass as he used to be.
BTW, maybe that's something Retro should do. Wouldn't they be able to take the stagnant Wario franchise and revitalize it into something awesome again? Its a shame there's only one Retro, because there are so many old franchises which could really use their touch.