Kyouko Aono

Kyouko Aono is Tsukune’s seventeen-year-old cousin, characterized by a stubborn and overprotective personality. A human with a tomboyish streak, she inadvertently enters the supernatural realm while searching for Yōkai Academy. After delivering a package containing the soul-stealing Lilith Mirror, she discovers the academy's true nature. Despite her friends' efforts to hide the existence of monsters from her, Kyouko remains a disruptive presence, even mistakenly suspecting Tsukune of having yakuza connections during the chaos of the school festival.