7. Petey Piranha (Mario franchise)
As far as Mario villains go, Petey’s one of the goofiest, which would translate into some fun gameplay mechanics for the oversized piranha plant. Our personal favorite is the Super Mario Galaxy flavor, one of the first bosses you come up against in the 2007 Wii hit. Besides that dangerous-looking tail and the sharp bite, Petey’s moveset can include fireballs, iceballs and ink attacks, causing foes all manner of annoyance.