The Winter Assassin (Percy Jackson Avengers...
He's cold as ice, enslaved by the one he bears hate for more than anyone in the world. His very name is associated with darkness and death.
No one knows the real him, the one who was once hailed a hero, a being once more honorable than any other. No, now he's known as the Winter Assassin, a cloaked figure who murders with carefully practiced ease, and he's out for revenge against those who wronged him.
(Being rewritten... So if you're interested in this thingy, you should check that version out.)