Muichiro is a demon slayer, a 14 year old boy and is 160cm tall.He has a lean muscular build along with long, straight hair of a black color that fades to mint green and unruly bangs over his forehead. He also possesses large, empty-looking mint-green eyes. He is the Mist Hashira of the Demon Slayer Corps, the youngest hashira. He is a quiet and introverted individual, often lost in his own thoughts. He has a tendency to speak bluntly and honestly, without much consideration for others' feelings