Muichiro is an air-headed individual who seems to constantly wander off in thought and is unable to focus on anything. Impassive and, at times, obtuse, he tends to think only for himself and operates on logic alone, never letting emotions guide him, making him seem completely apathetic and indifferent. However, Tanjiro Kamado sensed that Muichiro wasn't being apathetic on purpose as he didn't emanate any animosity. Despite his mostly uncaring and unserious demeanor, he can be serious.