Shougo Mikadono is the protagonist of Kono Naka ni Hitori, Imouto ga Iru!. Shougo is a handsome teenage with chin-length brown hair and gray/blue eyes. He is usually seen wearing the Miryuin Academy uniform. Ever since he was a child, Shougo has been a kind and caring person who can easily make friends and attract girls because of that. Furthermore, Shougo possesses an eyes for details, and the ability to deduc the mysteries around him through observation.