Vengance the Demon

This guy took so long to draw! It's not gonna be easy colouring him. I like him though because most other demon sonic oc's are like monsters and things, this guy almost looks normal at first glance.
Anyway background info:
You know when you hate someone so much you wish they were dead? That's when this guy comes, kinda like the opposite of the fairy in pinochio. His one and only goal in life is to one day fulfill the role of the grim reaper. He has become so single-minded over this mission that he has lost any of his personality, he also has next to no memory for he devotes every thought and every action to his goal.
The marks are from trades he has made with the devil (Iblis if you want), so that he can live longer, for once he achieves what he sees as his life's purpose, he will become immortal.