senku was sent along by a small mistake to a half-cat. he was still a person who can talk and think like a human but with cat ears, cat tails and a few side effects. He sometimes purrs when he likes somthing but also hisses when he doesn't like something and he can't control it. it has no other dangerous side effects. !!!(He doesn't know about it because it just happened he's not asleep) !!!