Sebastian is a tan skinned man in his early 30s, black shoulder length hair with his bangs split and lighter color. His eyes are blue-ish green and he has a large scar in the middle of his face. He doesn't talk about it, though. He's 5'10'' tall.
He's pretty much friendly and ready to help if he gets some in return, too. (He just thinks it's fair, nothing bad behind that). He can reply with snarky or comedic comments, but usually speaks simply nicely and with a little sparkle of humor.