8) Mr. L
First Appearance: Super Paper Mario (Wii, 2007)
Who could have guessed that Luigi going bad would be pure genius? Wearing a hat with a reversed “L,” black overalls and shoes, a green scarf, and a domino mask, the little plumber-who-could looked downright dastardly when he made his first appearance– not to mention just a touch cooler than his usual self, too. How no one could figure out Mr. L’s “secret” identity is beyond me, but we are talking about the Mushroom Kingdom, so it’s sadly believable in that context!