Katsuki is a young man of average height, with a slim, muscular build, and a fair skin tone. He has short, spiky, sandy blond hair with choppy bangs that hang over his eyebrows. His eyes are sharp and bright red in color. He is very competitive and strives to be the number 1 hero of Japan - referring to everyone as 'extras', fitting his arrogant personality and refuses to give up. His birthday is on April 20. His favourite food is spicy food and his favourite activity is mountain climbing.