Zero

After fighting a war against Sigma and the Mavericks alongside the Maverick Hunters and his brother in arms X, Zero offered up his body for anti-virus research, resulting in the creation of the Mother Elf but also the cataclysmic Elf Wars. After helping stop the conflict, Zero sealed himself away again, only to be awoken by a Reploid girl named Ciel a century later to help the Resistance fight the tyranny of Neo Arcadia. Zero is only the original Zero's mind in a new body. Zero's original body now serves as the body of the genocidal war machine known as Omega. 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 cannot win, such as when Ciel was captured by a Golem that Zero battled with the Buster Shot, dealing insignificant damage. He was slowly starting to lose hope until X gave him his Z-Saber back. Another example was when Dr. Weil told him he was a copy, causing him to believe he was not the real Zero. He only gained his confidence back when X claimed he was indeed Zero in spirit, resulting in a role reversal where X now has to encourage Zero compared to how Zero had to encourage X in their Maverick Hunter days. Most likely due to his amnesia, Zero is a much quieter and distant character. He rarely prolongs a conversation and provides only quick answers. He keeps his expression serious throughout the series, rarely showing any other kind of emotion, now no longer smiling at all. His moral code also seems to have changed. Although he used to be a heroic and proud Maverick Hunter, he became a soldier who will do whatever it takes to accomplish his missions. 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. He claims that he no longer cares about being considered a "hero", and that he just fights to protect what he cares about. He goes far enough to not restrain himself from the possibility of killing a human, a taboo that several other Reploids would not have the courage to break. This act properly classifies him as an anti-hero, with Zero himself admitting that he has never seen himself as a hero. This would also have made him a Maverick by definition, as he was a threat to a human's safety. There was one element of his personality that Zero seems to have maintained; his respect and admiration for his old partner, X. After defeating Copy X, he noted that despite his memory loss, he remembered the original X as being a true hero and, even explained how X originally was a coward and prone to worrying too much, and that him ultimately overcoming these flaws was what made him a hero, and being stronger than the copy.