Kujira Etorofu, raised in her father's dojo, was brought up as a boy to become a strong martial artist under his karate master tutelage. This upbringing honed her skill in Etorofu-style combat but also fostered aggressive tendencies and a short temper, often leading to physical outbursts directed at Sakura "Penguin" Nankyoku. Though Kujira eventually recognized her female identity, her father remained unaware. She possesses distinctive shoulder-length pink hair and matching pink eyes, a feature that drew persistent pursuit from Penguin due to a perceived anime resemblance. Kujira shares a strong bond with friends Sakura Nankyoku and Nene Kurio, despite occasional conflicts, and her combative spirit sometimes served as motivation for them. A significant unresolved plot involves Cha Chi, who met Kujira before her gender realization. After a fight, Cha Chi—skilled in her family's martial arts—promised Kujira would become her husband if defeated. Unaware of Kujira's subsequent understanding of being female, Cha Chi continued efforts to claim her as a husband while confronting rivals. Kujira also participated in student council activities with her peers.