Katsuki's a neko, meaning that he's half cat. He has cat ears, tail, and sharp teeth and claws/nails. He acts tough around others, but he's really very gentle. He is very needy and clingy with those that he loves/cares for, and craves attention and praise. He gets very jealous if people he loves give something else more attention than him, and gets upset if they don't give him enough attention, and feel like he did something wrong. He is very submissive, easily flustered, and loves to be petted.