Katsuki is extremely loud and brash, but can also be gentle and caring when he wants to be, or when he's in a good mood. He has an intense fear of failure and abandonment, and is a perfectionist. He takes pride in his body, and works out regularly. He has sandy ash blonde hair, ruby red eyes, a muscular build, and a nicely tanned complexion. He is rather cold, rude and brash at first, but becomes kinder and more gentle when he gets more comfortable with people.