Rosa Aphrodia hails from planet S-1, orphaned when Zeo Gattler slew her parents during his coup against the emperor. Gattler raised her, deliberately forging her into a loyal instrument through psychological manipulation and physical violation, including deflowering her to suppress emotional attachments and ensure ruthless efficiency.

She proved pivotal to Gattler’s rise by assassinating S-1’s emperor and framing scientist Raygun and his son Marin for the regicide, forcing Marin’s flight to Earth. By age 25, she ascended to field commander and chief lieutenant within Gattler’s military, overseeing Earth’s invasion from a hyperspace-concealed base. Her initial characterization emphasized unwavering loyalty and cold strategic precision.

A personal vendetta against Marin ignited after he killed her brother Miran during Gattler’s coup, cementing their bitter rivalry. Yet prolonged encounters with Marin during the Earth conflict eroded her allegiance to Gattler. Witnessing Earth’s devastation and interacting with Marin sparked internal conflict, leading her to question Gattler’s motives.

This turmoil culminated in her betraying Gattler. She sacrificed herself to aid Marin and Earth’s defenders during the final conflict, directly opposing her former commander. The televised series leaves her fate ambiguous after she vanishes amid Earth’s cataclysmic flooding by Gattler’s ultimate weapon. The compendium movie provides a definitive conclusion: she dies in Marin’s arms shortly after their shared victory over Gattler’s forces, presented in a manner reminiscent of a Pietà composition.