P much a Betta crossed with Humming Bird man a la
Dapeng.
He's prickly and slightly haughty but not outright aggressive. The most in terms of unprovoked aggression he'll probably do is snark at the player. If you're not going to be nice to him, he'll see no reason to be nice to you.
Would flaunt more and even flirt when interacting with feminine PCs while masculine PCs would probably have to "work" a bit harder to fuck him. Attempting to dominate him, sexually or otherwise, will end up in bad times for someone.
Pretty upfront about how he knows the PC is probably not going to devote themselves to him so in turn he's not going to pretend he's devoted to them. You're just fuck buddies basically. The only sort of exception to this would be him expressing interest in knocking the pc up if they have a fertile vagina.
Kinks he's supposed to cover would probably revolve more around rough sex ie. stuff like biting, hair pulling, light impact play, maybe dirty talk in which he talks down at you??, denial, etc
and aftercare because fight me.