Kenpachi Zeraki. Of course. Did anyone expect me to say anything different?
And yes, I know, he's from a mainstream anime, that makes me a bad Otaku, but fuck off. Kenpachi is the greatest, if not the ONLY great thing about Bleach. I garauntee if they made a spinoff with just Kenpachi and his past, ooooh...there would be a CULT following, a CULT I tell you.