I'm going to go with something I haven't seen, yet. Code Geass.
Lelouch molds himself into the enemy of the world, and he even goes so far as to use his Geass on his own sister. He wins, but Suzaku, acting as his knight, dies in battle.
During a parade to take his enemies to be executed, Lelouch's alter ego, Zero, appear at the last minute. Zero is actually Suzaku who kills Lelouch. With his death, the world comes together viewing him as their mutual enemy and various people are able to get past their differences to achieve peace.
I know there is some debate on whether he died or not, but from what I understand, the writer has said he likes the ending with Lelouch dying better.
During a parade to take his enemies to be executed, Lelouch's alter ego, Zero, appear at the last minute. Zero is actually Suzaku who kills Lelouch. With his death, the world comes together viewing him as their mutual enemy and various people are able to get past their differences to achieve peace.
I know there is some debate on whether he died or not, but from what I understand, the writer has said he likes the ending with Lelouch dying better.