Quick question - do characters like Sasuke or Seto Kaiba count? They had extended periods of time where they were villainous, even if they wound up on the hero's side at the end, so I wasn't sure. It doesn't impact my nomination in any way, but I figured I should ask. (also, it looks like Jolyne's in the wrong spot in the first post)
RAOH (Fist of the North Star)
Also known as Ken-Oh (King of Fists), Raoh was one of four skilled martial artists who was in the running to be the sole successor of the versatile martial art Hokuto Shinken. When his brother Toki was weakened by radiation poisoning and dedicated his life to healing others, Raoh was seen as the natural second choice. However, that title went to Kenshiro instead.
When society broke down in the aftermath of the nuclear war, Raoh sought to bring order to the land by any means necessary, becoming an almost ruthless tyrant (he has a soft spot for women, though that won't stop him from retaliating if they try to kill him) in order to bring society back together through force and fear. His ultimate goal, to quote the man, is "to fight God Himself," so nobody can accuse him of lacking ambition.
Raoh is an incredibly skilled and brutal fighter, combining his natural talent and massive size for devastating results. In addition, he's one of the few fighters in the series who can use ki energy like a projectile, creating an aura from his fighting spirit or firing it like a beam with his Hokuto Gosho Ha technique. In addition, he has a pet horse named Koku-Oh, who's ridiculously large fitting Raoh's own massive stature. (
here's Kokuoh preparing to crush a man beneath one of his hooves) Bare minimum, Koku-Oh could be summoned for some specials, running across the stage or rearing back and smashing his hooves into the ground.