- Official name:結城友奈
- English name:Yuuna Yuuki
- Chinese name:结城友奈
- Other names:ゆうき ゆうな
- Gender:Female
- Birthdate:Mar 21
- Height:154cm
- Bloodtype:O
- 学年:中学2年生
- 趣味:押し花
- 好きな食べ物:うどん
『Yuuna Yuuki』
A second-year in middle school and member of the Hero Club. She prides herself on being a hero, helping out others in need and always remaining optimistic. She uses armored fists for powerful close-range combat during her hero form and has a cow-like familiar named Gyūki(牛鬼) who, unlike the other familiars, likes to roam freely; she later gets another, cat-like familiar named Kasha(火車). As a result of using her Mankai form, she loses her sense of taste. Later, she uses the Mankai form for a second time and loses the use of her legs. Having fallen into a coma due to her efforts, she regains consciousness after Mimori's voice reaches her, as actually her soul was out of her body in a black hole-like realm. She soon recovers and regains her sense of taste and the ability to walk.