That's a tough one.. but I think if I had to pick one I'd have to go with Mieu, the "Cyborg" from PS3 who made it all possible. (Got a thing for claw wielding redheads >.>)

Runners up include Siren, the psychotic hate driven general of the Oraian army who returns to continue the war he was exiled from in the 2nd generation, and Lune, the Layan general who does the exact same thing.