the demon who is willing to become your butler if he gets your soul in exchange. graceful, accomplished, and practically perfect. Sebastian embodies the soul of gentility. make no mistake: underneath the polite exterior, he is still a demon, and perfectly willing (maybe even eager) to kill on command. makes contracts with people in exchange for their souls. as a symbol of the contract, he has a tattoo on his wrist and the same tattoo appears with whomever he signs a contract with