Akane Kimidori is the younger sister of Aoi Kimidori, who works at Penguin Village's Coffee Pot establishment. She attends Penguin Village Junior High School as a classmate of Arale Norimaki, forming friendships with Arale, Taro Soramame, and Peasuke Soramame.

Her characterization highlights a rebellious, delinquent personality marked by defiance toward authority and societal norms. This leads Senbei Norimaki to regard her as a negative influence on Arale. Despite this reputation, Akane actively participates in community life, engaging in school activities and events like the Penguin Village High School Olympics.

Family connections occasionally surface in her background, emphasizing her bond with sister Aoi. The two reside together in Penguin Village, with their interactions contributing to Akane's established context.

Throughout the series, Akane remains a consistent member of Arale's friend group. Later storylines introduce recurring romantic involvement with Tsukutsun Tsun, enriching her interpersonal dynamics within the ensemble. She appears across adaptations including the original manga, the 1981-1986 anime, and the 1997-1999 remake, consistently maintaining a secondary narrative role to central characters like Arale and Senbei.