Dan's a cambion brother to Dale, recruited by the same lust demon Dai. He succeeds relatively well at inspiring lust, but he tends to fall in love easily, so never rises to his daddy's level.
His technique is subtle, stand in the corner and make standoffish eye contact until a guy speaks to him, but once they start talking, they're drawn in, and so is he.
Dan is his nickname, which is short for Dantalion.