Slayer has brown hair, usually slicked to the side, complemented by a short well-kept beard and a thin mustache. He wears a monocle, and is often found smoking a pipe. He is a very suave and nonchalant man who is very aware of his own inhuman strength. He is very fond of romance and romantic topics as well as things he finds dandy, such as himself. He is a race of vampire called nightwalkers. He is effectively immortal. He is the founder of The Assassin’s Guild, alongside Zato-1 and Venom.