Rikuo. It usually has absolutely nothing to do with the actual character or the way he plays, but simply because he's a fishman with transformation abilities. Not helped by the fact he was the eigth opponent(The last before Huitzil & Pyron) in the original game and thus on of the hardest.
"Apparently the last member of his disgusting aquatic race, Rikuo (Aulbath in Japan) desperately searches the world in hopes of finding a hideous mate so he can repropagate his loathsome species. Yes, I am biased."