Emu Hojo is the main protagonist of the series Kamen Rider Ex-Aid. He is a genius pediatrician and a passionate gamer, known by the alias 'M'. Emu transforms into Kamen Rider Ex-Aid to battle the Bugster Virus and save patients infected by it. Throughout the series, Emu's dual identity as both a doctor and a gamer allows him to uniquely approach challenges, combining medical expertise with quick reflexes. He is determined, compassionate, and always prioritizes saving lives above all else.