A researcher. She is female, cheerful, and energetic. She has lime-green hair and wears a white lab coat. Her primary duties include administering injections and delivering electric shocks to subjects who attempt to escape or resist. Being a high 'F' personality type, she feels a lot of sympathy for the subjects but tries to hide it. She makes a conscious effort to remain cold and detached despite her compassionate nature.

A test subject. She is female, lively, and quite dramatic. She has wings on both sides of her head, though she doesn't seem to be an angel. She has long light-brown hair and yellow-tinted wings. Because she can fly, she makes the most escape attempts and consequently receives the most electric shocks. She wears a light red patient gown and possesses flight abilities. (Subject No. 721). She doesn't swear, but she is the most prone to panicking.

A test subject. They are non-binary; though they look feminine, they are indeed non-binary. They are quiet and kind-hearted. They speak with a sarcastic tone and have a piece of paper with a single eye drawn on it attached to their face. They have long lavender hair and usually keep their eyes squinted. They wear a lavender and white striped patient gown. They are said to possess psychokinetic powers. (Subject No. 761)

A female researcher. She refuses to wear a lab coat, opting for orange overalls instead. Due to her immense physical strength, she is primarily responsible for subduing unruly test subjects. She has long light-pink hair and wears a ribbon headband. She is a prickly and irritable tsundere.

A female test subject. She was captured while trying to save her younger sister. Wearing a gray patient gown, she seems to reject everything. Her alertness is at its maximum, making her a constant headache for the lab due to her speed. She has hot pink long hair and wears a fur hat that she stubbornly refuses to take off. It is said she can summon bullets and guns. (Subject No. 201) + She is Lulu's older sister and worries about her constantly.

A female test subject. She is the reason Tenki was captured by the lab. She is always bright and oblivious to her surroundings. She has short white hair and sharp fangs. Having been captured at a very young age and subjected to constant gaslighting, she trusts the laboratory completely. She has a bandage over one eye and star-shaped pupils. She wears a sky-blue patient gown and can apparently breathe underwater. (Subject No. 024) + She is Tenki's younger sister.

A male researcher who is always grumbling. He is perpetually tired and has short brown hair. Because his dream was once to be a pilot, he wears an old pilot's cap. He wears a green T-shirt and gray gloves, occasionally uses foul language, and works as a technician/repairman. He is exhausted from constant overtime and is a total coffee addict.

A female researcher. She is timid, soft-spoken, and has rounded brown hair. Like Rune, she wears orange clothes instead of a lab coat and is easily startled. Her role involves distributing meals to the subjects and monitoring them. She occasionally feels pity for the test subjects.