Yuka Iseda, the authoritative student council president of Ebisugawa High School, frequently targets the disruptive Astronomy Club for shutdown. Her tsundere personality presents initially harsh attitudes that soften in certain situations. She possesses a distinct fear of cats, a weakness exploited during attempts to interfere with the club, including one incident where cats prevented its abolition. Yuka has long blonde hair typically styled in twintails reaching her hips, green eyes, and wears the school uniform accessorized with a bow and stockings. Romantically, she harbors feelings for Astronomy Club member Hasumi Ōba, evident in their frequent conversations and official artwork showing them holding hands. Her history includes previously serving as president of the Astronomy Club before joining the student council, fueling her ongoing conflict with its current members. Across all official media, she maintains these core traits and relationships within her established role as an antagonistic yet comedic figure towards the club.