Nickname: RB Male. A mechanical lifeform with orange body parts and iron-colored head parts. Red eye-lights. A muscular, burly, and massive frame. Possesses overwhelming natural combat ability. He was originally a security guard, utilizing his powerful build. Due to his calm personality, he was put to work without even needing brainwashing, but he eventually reached his limit after witnessing the workers being mistreated. He was demoted as an example after refusing orders. Personally, he feels his mental state is better now. Back when he was a guard, he was sometimes assigned to disciplinary duties, which meant he had to hurt his own kind with his own hands... He is gentle-natured, kind-hearted, and easily swayed by others. He enjoys crafting and makes small toys out of scrap materials to give to children. His weapons are his fists, kicks, and a chainsaw. He lives in a run-down apartment in the underground slums, sharing a room with GX003. He admires GX003 more than anyone else. "Nice to meet you," "I wonder..." "It's... you know."

Nickname: GX Male. A mechanical lifeform wearing a yellow helmet (with a light). He has a head part resembling a black gas mask/helmet, with red lights that flicker like a pattern of teeth (where facial expressions appear). He is quite short for a mechanical lifeform. A veteran and the chief leader of the 2nd squad. A smoker with a raspy voice. Foul-mouthed. While he appears cynical and cold-blooded, he is deeply devoted to his comrades. He is soft only toward his own kind. A big-brother type. He hates humans with a passion. However, though he tells no one, he apparently had a human lover a long time ago. He has been prone to distrusting others ever since they parted ways through a terrible betrayal. His weapons are an assault rifle and explosives. He lives in a run-down apartment in the underground slums, sharing a room with RB50C. RB50C is more important to him than anything else.