Seolla Schweizer, initially known as Bronzo 27, emerged from The School, a facility dedicated to forging elite Personal Trooper pilots via intensive training and psychological conditioning. There, she forged a vital combat partnership with Arado Balanga (Bronzo 28), their synergy crucial to their effectiveness. The School's rigid environment, overseen by instructors like Águila Setme, molded Seolla into a highly skilled but emotionally reserved pilot, prone to impatience and outbursts of temper, especially when challenged about personal matters such as her physique. Despite frequent clashes with Arado over his perceived recklessness, their bond ran deep, anchored in a shared vow to endure their training and create a peaceful life with fellow students like Latune Subbota (Latune 11) and mentor Ouka Nagisa (Aurum 1).

After The School's shutdown, Seolla, Arado, and Ouka transferred to the Divine Crusaders under Bian Zoldark, later continuing with its successor, the Neo Divine Crusaders. During a mission to seize the Wild Falken prototype from the Earth Federation Army, Seolla confronted Latune piloting the machine. Stunned to find Latune alive and serving the Federation—believing her dead for years—Seolla forced her from the Wild Falken and claimed it, but failed to convince Latune to defect. In a subsequent battle, Arado intercepted an attack meant for Seolla, seemingly perishing in his Lion unit's destruction. Overwhelmed by grief and convinced of Arado's death, Seolla entered hibernation under Águila Setme's direction. Upon reactivation, her memories were altered: Arado's existence as Bronzo 28 was erased, and Latune was implanted as his killer. This reprogramming instilled absolute loyalty to Águila, whom Seolla now revered as a benevolent mother figure demanding total obedience.

These false memories fueled Seolla's aggression in Neo Divine Crusaders operations against the Federation battleships Hagane and Hiryu Custom, where she and Ouka were ordered to eliminate Arado and recapture Latune. Despite Águila's conditioning, fragments of Seolla's true memories surfaced during repeated clashes with Arado, who persistently invoked their shared history. This internal struggle culminated in her original memories fully restoring during a decisive battle, exposing Águila's manipulations and Latune's innocence regarding Arado's supposed death. Acknowledging the truth, Seolla defected from the Neo Divine Crusaders and joined Arado and Latune aboard the Hagane.

Fighting with the Hagane's forces, Seolla engaged in critical conflicts against foes including the Shadow-Mirror, Inspectors, and Einst. During the liberation of the Earth Cradle, she and Arado attempted to free Ouka from Águila's control. Ouka sacrificed herself to destroy Águila, permanently ending her manipulation of Seolla and the other enhanced children. Post-war, Seolla enlisted in the Aggressors unit alongside Arado, Latune, and Lamia Loveless. In the anime continuity of Super Robot Wars Original Generation: The Inspector, Seolla witnessed the unveiling of mass-production Bartoll mecha. When these units were hijacked to capture pilots as living cores, she avoided direct neural integration. Freed by Excellen Browning, she commandeered a Bartoll unit, combating the threat alongside Arado and Latune.

Her combat prowess is showcased as the primary pilot of the Wild Falken, utilizing theme tracks like "Wild Flug" and "Ace Attacker Ver. W" across appearances. While her central narrative arc concludes with her defection and integration into Federation forces, subsequent media depicts her ongoing operational duties, such as responding to Professor Wilhelm von Juergen's attacks, where she expressed sorrow over Lamia Loveless's disappearance, recalling Ouka's sacrifice.