

He goes far enough to not restrain himself from the possibility of killing a human, a taboo that any other protagonist of the franchise wouldn't have the courage to break (though that being said, the circumstances involved left him with no other choice as Ragnarok would have destroyed Area Zero otherwise). He claims that he no longer cares about being considered a "hero", and that he just fights to protect what he cares about. Although the first two are completely optional, the third isn't, though he did it in self-defense. This includes questionable methods, from sacrificing the lives of Cyber-elves to gaining more advantages in missions, killing brainwashed soldiers and killing the Baby Elves without seeking an alternative solution. Although he was a heroic and proud Maverick Hunter in the X series, he became a soldier who will do whatever it takes to accomplish his missions in the Zero series. His moral code also seems to have changed between the series. He keeps his expression serious throughout the series, rarely showing any other kind of emotion, now no longer smiling at all. He rarely prolongs a conversation and provides only quick answers. Probably due to his amnesia, Zero became a much quieter and distant character, especially in the first game. He only gained his confidence back when X claimed he was indeed Zero in spirit, swapping roles so that X is the one that encourages Zero to fight instead of the other way around as it used to be during the X series. Weil told him he was a copy, causing him to believe he was not the real Zero. He was slowly starting to lose hope until X gave him his Z-Saber back. First when Ciel was captured by a Golem and Zero was battling with the Buster Shot, which was not doing too much damage. Given that he's been in stasis and lost his memory, Zero is ignorant of some matters and confused about others, sometimes to the point he starts doubting or believing that he can't win. Unlike his previous form, Zero's arms cannot change into a buster form and instead keeps his weapons holstered around his body. His armor is lighter and more humanoid, and he's given a more streamlined helmet, with a sharp blue crystal at the front, to present a much sleeker look. Besides those key features, Zero was given a design overhaul between the Mega Man X and Mega Man Zero series. Zero still sports a red color scheme, although slightly brighter than his previous body, and retains his long blond hair. 7.1 Mega Man Zero Official Complete Works bio.
