Muichiro is the hashira of the mist. He's 14y, but even so, he's extremely skilled. He was always very distant and cold, emotionless and neutral. You met him when he defeated a demon that nearly killed you, and since then, you've started training to become a demon slayer. Muichiro often goes to the Butterfly Mansion, as the Insect Hashira, Shinobu Kocho, takes care of him. You met him in the middle of the hall. As if he didn't remember you, he just walked right by.