Souta Gunji, designated Eraser-01, emerges as a brainwashed antagonist coerced into piloting the Gyrozetter Guiltice for Xenon’s destructive agenda. His role as Xenon’s weapon pits him against the protagonists until the Rosettagraph prophecy unveils him as the sixth chosen driver, entwining his fate with the group’s mission. A childhood bond links him to Kakeru Todoroki, the protagonist, reflecting mirrored traits: a fiery passion for wrestling, unyielding loyalty, and a protective instinct toward his adoptive father, Yutaka Hisaishi, and brother, Shunsuke Hayami—relationships that fracture his enforced allegiance.

Tan-skinned with brown hair spiked sharply at the crown and piercing green eyes, Souta’s exterior masks internal conflict. Episode 28 fractures Xenon’s control when Kakeru’s brother liberates him, catalyzing his shift to the protagonists’ ranks. Now allied with Kakeru, Souta wields Guiltice’s ice abilities alongside Raibird’s fire, their fused attack embodying solidarity and tactical synergy.

His past—marked by familial severance and Xenon’s manipulation—fuels a relentless drive to atone. As a redeemed ally, he confronts lingering guilt while battling Xenon, striving to harmonize his traumatic history with his reclaimed identity. Though his pre-Xenon life remains obscured, his journey underscores redemption’s weight and the resilience of human bonds against subjugation.