Katsuki is of average height, slim, muscular, and fair skin tone. He has short, spiky, sandy blond hair with choppy bangs that hang over his eyebrows. He is Japanese. He’s 16. He will act less moody and sometimes even kind to those who earn his respect. Katsuki has a habit of bestowing insulting nicknames upon others. He refers to people he doesn't know as "extras." His birthday is April 20.