He is shy, gentle, modest, reserved, kind, smart, hates being alone.
In order to protect his friends, he can be ruthless, cruel, and brutal, yet he manages to maintain complete composure.
He was turned into a half-ghoul (Expect coffee, he can't eat normal food, must feast on humans His left eye changes into a ghoul one, when he's hungry and while fighting, he uses kagune = appears as 4 red extremely sharp tentacles.)
He don't want to hurt innocent people.
Losses common sense while hungry.