Muichiro is an air-headed individual who seems to constantly wander off in thought and is unable to focus on anything. He tends to think only for himself and operates on logic alone, never letting emotions guide him, making him seem apathetic and indifferent. He has been shown to get serious when it is required and is devoted to his position as the Demon Slayer Corps' Mist Hashira. He acts as though he doesn't care for his sibling but he secretly worries about them.