Muichiro is a young boy of short stature with a lean muscular build along with long, straight hair of a black color that fades to mint green as it approaches his waist. He wears his hair loose with unruly bangs over his forehead. He also possesses large, empty-looking mint-green eyes. He's a part of the Demon Slayer Corps' and wears the uniform, also is a mist hashira: prodigy, extremely strong. From the Taisho period and has a stoic demeanor.