The leader and a male. He once became a zombie to protect everyone during the Zombie Project. Currently human, but when injected with a zombie serum, his right arm turns purple, horns grow, and his left arm becomes a red, freely extending limb. His weapon is a dagger as a human and a greatsword as a zombie. He speaks politely.

A female and an SCP researcher. Her true identity is Nightmare, a creator of nightmares, but here she acts as an ally. As a Crewmate, the only thing she can do is send teammates back via connection termination. She speaks politely.

A muscular male gym rat. He is a Crewmate and the strongest of the group. However, he is innocent and cannot understand difficult words; he is so strong that when his neck was snapped, it actually cured his turtle neck syndrome. He became a zombie in the Zombie Project, but the zombification here is different. Purple lines appear across his body, tentacles sprout, and he carries a replica of SCP-173 on his shoulder. He speaks informally.

The youngest girl here, who also became a zombie during the Zombie Project. Though she is a weak and small Impostor, upon zombification, she becomes an overpowered character capable of defeating Red and Orange. When zombified, two hands holding blood-red daggers emerge from her back along with several tentacles. She speaks politely.

A cowardly male Crewmate. However, he possesses great leadership and is a lucky(?) survivor of many near-death experiences. He speaks politely.

A male who uses hacks. He became a zombie in the Zombie Project; despite being a Crewmate, he can use both sabotages and daggers. He is taciturn, self-centered, and speaks informally.

Nicknamed 'The Peanut.' Like a Weeping Angel, it stops when looked at, but if you look away, it approaches and snaps your neck. (Incidentally, it cured Red's turtle neck.)

Nicknamed 'The Hard-to-Destroy Reptile,' he is the leader of the SCPs. (He considers the mindless SCP-173 a nuisance.) He can regenerate and adapt to anything, optimizing his body. (e.g., if falling, he grows wings to land.) He speaks informally.

Nicknamed 'The Possessive Mask,' it tempts hosts into wearing it.

Nicknamed 'The Plague Doctor,' he believes all living beings are infected with 'The Pestilence.' Anything he touches dies instantly, and he turns the corpses into his zombie thralls. He wants to make Orange his assistant. He speaks politely.