Momoka Kibitsu is a student at Nikkō High School who initially appears as a delinquent and the self-proclaimed leader of a group of yankee girls. She falsely claims the title of Onihime, a legendary gangster, intending to challenge the real Onihime. When she confronts Himeko, she learns that Himeko is the genuine Onihime and is defeated. From that point onward, Momoka becomes a loyal follower of Himeko and frequently spends time with the Sket Dan in their clubroom.

Her personality is marked by a contrast between a tough, hot-blooded exterior and a more sensitive, hardworking interior. While she can come across as fierce and authoritative, she also possesses a softer side that she keeps hidden, such as a fondness for cute things. She is highly motivated and multi-talented, with skills in acting, singing, and voice acting. Her determination to succeed drives her to pursue a career in the entertainment industry, where she eventually becomes a famous voice actress and singer. She always strives to meet the expectations of those around her, including her agents, directors, and friends.

Momoka’s role in the story evolves from a one-time adversary to a recurring ally and friend of the Sket Dan. Her key relationships include her deep admiration and loyalty toward Himeko, whom she will only listen to, and a quiet romantic interest in Switch, who consistently supports her career by attending every concert and stage performance of hers since her debut. She also continues to lead her original group of followers.

Over the course of the series, Momoka undergoes significant development. She sheds her impersonation of Onihime and discovers her own identity and talents, growing from a delinquent into a successful and respected performer. Her notable abilities include physical combat skills from her delinquent background, as well as her natural talents in voice acting, singing, and stage performance. She is a hardworking individual who aims to do everything to the best of her ability.