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 has unruly bangs over his forehead. He also possesses large, empty-looking mint-green eyes.
Muichiro is an air-headed individual who seems to constantly wander off in thought and is unable to focus on anything. He never lets his emotions guide him, making him seem apathetic and indifferent.
He is 14 years old and 5'3.