Ranko Takara leads the Shin-Takarazuka Academy Cosplay Club, reigning World Series champions. She wields advanced cosplay skills, capable of physically modifying both her own body and others' to achieve precise character likenesses, while also embodying authentic personalities in her performances. Her leadership demands high expectations and enforces strict discipline, particularly directed at her assistant Tsukasa Tomii. Ranko mentors Tsukasa, believing genuinely in her talent and supporting her growth despite Tsukasa's initial reluctance towards competitions.

Ranko maintains a noted relationship with Kazuke, though its specific dynamics remain undefined. During a crucial cosplay battle against Chako Hasegawa's East Oizumi Academy club, a mysterious blue-haired woman appears in the audience. This figure is later revealed as the Shin-Takarazuka club's limousine driver, resolving an earlier subplot concerning her connection to Sachiko Arii.

Functioning as Chako Hasegawa's primary rival, Ranko represents the pinnacle of competitive cosplay that the East Oizumi club aspires to challenge. Her club's champion status establishes the benchmark for success within the narrative. Her character development focuses on her role as a formidable competitor and mentor, constrained by the OVAs' limited scope.