Basically a sarcastic version of the Nameless man from the Fistful of Dollars series. A young Harrison Ford kind of character. Walk into town, get fame, kick ass, bone the leading lady, all while making snappy remarks to just about everything and somehow managing to adhere to a code of honor.
My dealio is that he's already at odds with monsters, even sentient ones, and that his main girl is kind of a Game-of-Thronesy seductress who's all about the wang and doesn't really care about his feelings or his sort-of-but-not-really daughter. It'd be quite the character arc to see him meet a sexy monster who's actually emotionally responsible, and it would be interesting to see how she'd deal with a monster slayer that somebody hired to find a missing jaundiced girl.