OVA
Description
C-ko Kotobuki features in multiple Project A-ko installments, with distinct portrayals in the main continuity and the Project A-ko: Uncivil Wars alternate universe.

In the original 1986 film and its direct sequels, C-ko is a perpetually cheerful, naive 16-year-old Graviton High School student. Her personality exhibits childlike innocence, optimism, and emotional outbursts, often crying when distressed. She shares a deeply attached friendship with A-ko Magami, dating back to kindergarten, frequently relying on her for protection. This closeness draws the antagonism of B-ko Daitokuji, who aggressively seeks to separate them. C-ko's disastrous culinary efforts produce bizarre, inedible meals despite her enthusiasm. A significant revelation identifies her as the lost princess of the all-female alien Lepton Kingdom of Alpha Cygni, leading to her abduction by aliens. While she initially decides to leave Earth with her biological mother, she later reverses this choice to reunite with A-ko. In later OVAs like Project A-ko 3: Cinderella Rhapsody, her attachment manifests as jealousy when A-ko pursues romantic interests, particularly Kei Yuki, whom C-ko views as a rival, culminating in feral, cat-like hostility toward Kei. Project A-ko 4: FINAL revisits her alien heritage as the Lepton fleet returns, but she ultimately rejects her royal destiny to stay with A-ko.

Project A-ko: Uncivil Wars presents an alternate continuity where C-ko's background differs significantly. She is the daughter of a wealthy intergalactic corporate executive, not an alien princess. Her abduction by space pirates Grash and Liza serves as the inciting incident, with her father offering a reward for her rescue. This prompts A-ko and B-ko, depicted as adult bounty hunters partnering in a desert wasteland, to pursue her recovery primarily for financial gain. The pirates' leader, Gail, intends to use C-ko's body as a vessel for the ancient sorceress Xena, who plans universal annihilation. In this iteration, C-ko retains her core innocence and passivity but lacks the explicit alien royalty connection or intense culinary focus. Her role is largely that of a catalyst for the action, driving the plot toward a multiversal confrontation.