Eraser 666 emerged from a nameless existence, a socially withdrawn comic collector who sought to obliterate his past by immersing himself in Gyrozetter figurines. Witnessing Guiltice’s destructive might on a news broadcast ignited his obsession, driving him to forge a counterfeit Eraser Corps suit and Soul Eraser. Adopting his numerical alias, he falsely asserted ties to the Four Eraser Royals, defying logic to align himself with Eraser-01—a figure he idolized for single-handedly crushing Kakeru. His philosophy hinged on brute strength and isolation, believing compassion to be weakness.

Posing within Xenon’s ranks, he orchestrated a fabricated crisis to bait Souta, now reformed, into battle. Piloting his Gyrozetter Ursus, he overwhelmed Souta and Guiltice initially, mocking their bonds as frailty. Yet in their rematch, Souta shattered his replica weapon’s facade, exposing its frailty. Guiltice exploited Ursus’s flaws, toppling Eraser 666. Defeated, he observed Kakeru, Souta, and Raibird unite against Eraser Ace, their solidarity sparking an epiphany: camaraderie, not solitary might, forged true power.

Overwhelmed by this revelation, he shed his impostor identity, denounced Xenon’s dogma, and proclaimed himself Arcadia’s self-styled “seventh chosen driver.” Parting ways amicably, he pledged to carve his own heroic path. Post-conflict, he joined Eraser Ace as a stunt driver duo, embodying his redemption through partnership. His trajectory—from hollow imitation and isolation to self-forged identity and alliance—underscores his rejection of artificial validation for authentic bonds, cementing his evolution from antagonist to redeemed ally.