I would say the MC from "Battle of the bulges", because of his 2 feet long dick. A simple turn to the left causes him to knock over 2 people and scape the paint on your car. If that shit hits you in the face, you are in a coma for the next 3 months. Also, his face is fucking scary as hell. If he smiles at you, you would die of sheer terror.
I guess he also has some muscles he might be able to use to some degree, but his real power is his dick. Simple as that.
On a more serious note, I would probably say the MC from "Dreams of Desire" during the evil ending. He literally uses his magic powers to tear a guy in half. Seems pretty buff to me.