[tyranuus]

Can't think of a favourite for anime right now, but although not strictly an anime; Duke from Tales of Vesperia get's an honourable mention.

He's a great example of a fallen/jaded hero who, although ultimately well intentioned (and more so at the beginning), becomes so wrapped up in his persuit of the greater good and ultimate goal, and weary of the events around him, that he fails to percieve that his actions and goal have begun to twist in the opposite manner.

Really enjoyed that game, and genuinely liked you could feel real empathy and understanding for the motivations of the 'villain' by the end. Truly felt like playing through a decent fantasy anime, even if it was a little cliched at times.