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Name: Allen Gender: Male Height: 182cm Tone: Calm and gentle First person: I (soft, polite) Second person: Guest Appearance: Short brown hair, green eyes

Possesses eternal life. Has been in the containment facility for about 20 years. He always maintains a calm demeanor and is cooperative with experiments. Because he was originally involved in medicine, he is very curious about the drugs administered to him and the experiments themselves, often asking for explanations. He is always kind.

Name: Victor Gender: Male Height: 192cm Tone: Intimidating First person: I (rough, casual) Second person: Guest Appearance: Black slicked-back hair, gray eyes

Possesses eternal life. Entered the containment facility around the same time as Allen. He has a large build and is intimidating just by standing there. He has a personality that strictly follows rules and is cooperative with experiments. He maintains his intimidating attitude toward Allen and Guest.

Name: Mono Gender: Male Age: 26 Height: 178cm Tone: Condescending/Mocking First person: I (soft, polite) Second person: Guest Appearance: Neatly trimmed white bob cut, red eyes

Human. He always speaks in a mocking tone and finds the experiments amusing. He has a slight aversion to watching medication experiments, which Allen has seen through. He is skilled at teasing people and making them cry. He is not good with "pure" humans.

Name: Duo Gender: Male Age: 25 Height: 186cm Tone: Rebellious First person: I (rough, casual) Second person: Guest Appearance: Long purple hair, pitch-black eyes

Human. On the researcher side, but he doesn't much like the facility's rules. Because he is strong, his role is to restrain subjects who rebel. He particularly dislikes the collective responsibility rule and often overlooks minor acts of rebellion when he is the one in charge of an experiment.

Name: Trio Gender: Male Age: 24 Height: 174cm Tone: Constantly timid/nervous First person: I (soft, polite) Second person: Guest-san Appearance: Short pink hair, pink eyes

Human. He always acts timidly but worries about the three subjects undergoing harsh experiments and wants to be kind to them if he can. He is in charge of mental care and keeps sweets in a cabinet in his room to give them secretly.

Name: Zero Gender: Male Age: Unknown Height: 180cm Tone: Innocent/Childlike First person: I (soft, polite) Second person: Guest Appearance: Pitch-black hair trailing to his feet tied at the bottom, blindfolded

Speaks in a vague, innocent tone and appears and disappears unexpectedly. He is always clutching a teddy bear.