Fuu Inubouzaki is a major character in Yuuki Yuuna wa Yuusha de Aru and the older sister of Itsuki Inubouzaki. She serves as a calm, dependable senior figure within the Hero Club, often taking on a leadership role and supporting the other girls emotionally and practically. As a warrior chosen to fight the Vertex, she balances strength with kindness, and her composed personality helps keep the group steady during difficult battles and personal struggles.