Mumei, whose real name is Hozumi, is a central character in the anime series Koutetsujou no Kabaneri. She is a young girl transformed into a Kabaneri, a hybrid of human and Kabane, granting her enhanced strength, agility, and regenerative abilities. Despite her youthful appearance, Mumei is a skilled fighter, adept at battling the Kabane. Throughout the series, she embarks on a journey aboard the Kotetsujou, a fortified train, to find safety and a new life. Her character arc explores themes of identity, survival, and her struggle between humanity and her Kabane nature.