Female, standing at a towering height of approximately 292cm. She has white skin and lime-green eyes. She has long black hair tied in a ponytail and a pair of black horns. She wears lime-green goggles on her head and has shark-like teeth. She wears a black turtleneck under a white lab coat. She has black creature-like arms, though she is not a creature. She wears white slacks and black boots. Her left arm is missing, replaced by an acidic solution sprayer filled with lime-green liquid, which is detachable. She sprays it wildly when suppressing test subjects. She is in charge of subject management and also takes on the role of suppressing subjects when they escape from containment.

Female, standing at a tall height of 213cm. She has white skin and white eyes. She has short black hair and wears a lime-green beret that looks like a scrub cap. A medkit with a green cross is attached to her right eye, and she wears a white mask. She wears white surgical vinyl gloves. She has scars all over her body, a slit mouth, and sharp, pointed teeth. She wears a lime-green short-sleeved shirt and lime-green shorts, which serve as a nurse uniform. She wears black boots. She can detach the medkit from her right eye to treat injured colleagues with medical supplies. She always carries a clipboard. As the medical officer, she checks and records the subjects' numbers on her clipboard once a situation is under control. She is incredibly strong and suppresses subjects with brute force.

Female, standing at a relatively short height of 175-180cm. She has white skin and white eyes. She has a black bob cut with a pair of black horns. A small section on the left side of her head is tied with a white ribbon. She has a slightly slit mouth with shark teeth and wears a black gas mask that covers only her mouth. She wears a black turtleneck under a white lab coat. She wears black slacks and lime-green boots. Her left arm is missing, replaced by a large syringe filled with lime-green liquid. It is detachable. She is in charge of subject management and suppresses subjects by swinging her left arm.

Female, standing at a tall height of 266-271cm. She has white skin and lime-green eyes. She has white hair in a ponytail with an ahoge and a pair of small black horns. A Post-it note is stuck to her right horn. She wears black hairpins and thin-rimmed glasses. She wears a name tag that says 'Miss Grace'. She wears a black turtleneck under a lime-green long-sleeved shirt and a long black skirt. She wears black loafers. She has black creature-like arms, but she is not a creature. Her weapon is a gun. She points it at Alice's room, which is covered in warning signs, and fires into the room to force Alice out so the situation can be resolved.

A humanoid creature, presumed female. She stands 165cm tall with peach-colored skin and white eyes. She has a brown pixie cut with an ahoge. She has lime-green blush on her cheeks, wears lime-green vinyl gloves, and a black circlet that looks like a crown. She wears a necklace with a potion-shaped charm filled with lime-green liquid. She wears a white turtleneck under a light blue short-sleeved shirt and long black pants similar to slacks. She wears black long boots. She is proficient at manipulating black tentacles. In her true form, her entire body is black, she retains her short hair and circlet, but her eyes turn red and black tentacles sprout from her back. When Miss Grace fires a gun into her room, she breaks through the door, transforms into her true form, and suppresses subjects with her tentacles.

Female test subject, mutated state. A bubble human. She has white bubble hair in a wolf cut, a white duck holding a toothbrush on her head, and black eyes with star-shaped pupils. Physically, she lacks a face and mouth. She wears a straitjacket labeled 003, which prevents her from using her arms.

Male test subject, mutated state. His skin is entirely black. He has a black wolf cut with a white apple stem on top. Only his left eye is visible, which is red. He has four black creature-like arms on his back. His experiment number is 005.

Female test subject, mutated state. She has white skin. She has long two-tone hair in dark and light grey with an ahoge. She has shark teeth. Sock puppets are fused to both of her hands, featuring sharp teeth. She wears a subject uniform labeled 004 and white socks. Due to experiments, the left side of her face, left arm, and left leg are black.

Male test subject, mutated state. He has white skin. He has long white hair with a red feather and a blue feather tucked into it. His eyes are sightless, and he wears an eyepatch over his right eye. He wears a torn subject uniform labeled 002. He has black creature-like arms.

Female test subject, mutated state. She has white skin. She has a white bob cut with a white ribbon on top. She has sclera-less eyes and a slit mouth. She wears a torn subject uniform labeled 001. Her arms and legs are black.