Suiren Koushuu works alongside Mina Tsukuda as an announcer for the sports program "SpoLuna," where her professional demeanor and experience command respect. She maintains a calm and mature personality on-air, serving as an inspiration for her colleague Mina.

Her alter ego, Ootsuki Miina, stands in sharp contrast. This transformation triggers a significant behavioral shift, characterized by intense enthusiasm and a tendency to become excessively absorbed in battles, frequently causing unintended property damage during her interventions.

A professional rivalry exists between Suiren and Sumire Nishiha, an intergalactic celebrity from Planet Miina. Sumire actively undermines Ootsuki Miina's reputation, painting her as a chaotic figure driven by a love for destruction, stemming from jealousy over Ootsuki Miina's popularity. This conflict escalates when Mina Tsukuda reveals Sumire's true identity, prompting other Rabbit Force members to oppose Sumire's schemes.

Suiren shares a sibling-like friendship with fellow SpoLuna announcer Daisuke Kiryū, noted for its closeness and mutual respect in their professional environment.

Transforming into Ootsuki Miina involves consuming a specific food item tied to her alter ego and invoking the term "Ju-Jytsu," resulting in physical changes including pink or red eyes. Her transformed appearance features a distinctive bodysuit with a deep neckline reaching the crotch area. As Ootsuki Miina, she utilizes specialized high-tech equipment during operations.

The character appears in related media, including special episodes following the main series. One instance occurs during a mockumentary sequence in a special episode where Spo Luna staff witness Minamo Haibara transforming into her Miina form, prompting reactions like Kato questioning the sudden commentary.