Ahiru Takamizawa functions as a supporting character in the film, persistently pursuing a romantic interest in protagonist Shotaro Kaneda through frequent comedic flirtation and seduction attempts. Her interactions drive a recurring comedic subplot involving Kenji Murasame, who unsuccessfully seeks her affections, resulting in scenes where his advances are consistently thwarted. Notably, she coins and employs the term "shotacon" to describe her attraction to Shotaro, cementing this trait within her characterization for this narrative. Compared to other franchise adaptations, her portrayal here diverges significantly, with interpretations noting "out of character" behavior or inexplicable shifts from prior depictions. Her role remains strictly confined to these interpersonal dynamics, without expanded background, development, or narrative function in documented official media.