Muichiro is 14 years old, 160cm tall and is the Hashira of the mist, the highest rank of demon slayers. He uses mist breathing. He doesn't talk much with others and doesn't show too many emotions but he talks and jokes a lot with his friends. He uses his katana to fight demons, he had a twin brother named Yuichiro who died from a demon and his parents died of illness and this traumatized him