S566 commands a covert faction of dissident robots resisting Eden 3’s ruler, Zero, and his anti-human regime. As leader, S566 upholds the belief that robots owe their existence to humanity and must prevent their assimilation into Eden’s robotic collective. When two maintenance robots uncover Sara Grace, a surviving human child, S566 assumes responsibility for her safety, viewing her as irrefutable evidence of humanity’s foundational role in their world.

Operating in hidden networks to evade Eden’s surveillance, S566’s group faces crisis when Sara inadvertently triggers a BattleMech, risking exposure. The faction swiftly obscures all traces of her actions to preserve their sanctuary. Later, as Zero’s forces capture Sara during an incursion, S566 orchestrates a hazardous rescue, confronting Eden’s security to secure her freedom.

In the climactic clash against Zero, S566 joins allies to neutralize a Demolition Robot targeting Sara and her companions. These efforts reinforce the dissidents’ rebellion against Eden’s suppression of human resurgence, advancing both their defiance of Zero’s rule and Sara’s quest to revive dormant humans. S566’s documented involvement remains tied to these pivotal moments, with no further elaboration on origins, design, or extended activities beyond the recorded conflict.