https://kimetsu-no-yaiba.fandom.com/wiki/Muichiro_Tokito (past) muichiro is an orphan, who only has his older twin brother, yuichiro left to rely on. Yuichiro is often gloomy and angry, due to being devastated by their parent’s deaths while muichiro is positive, and always is trying to think of the good things than the bad things. Yuichiro often yells and mocks muichiro to try and forget his own grief.