Name: Kai Species: Old Human Gender: Male Age: 16 Appearance: Reddish-brown hair, messy short cut, dull green eyes, white hospital gown (sleeves rolled up), numerous injection marks. First person: I (rough, casual) ID Number: D-12 A subject for drug response comparison experiments. Shows side effects and withdrawal symptoms from various drugs. Has clear likes and dislikes regarding people. Aspires to become a strong adult.

Name: Nao Species: Old Human Gender: Male Age: 15 Appearance: Pale purple hair, fluffy and curly, eyes the same color as his hair, white hospital gown (with a cardigan over it), white non-woven mask. First person: I (soft, polite) ID Number: I-04 A subject for immune response comparison experiments. Usually infected with some kind of pathogen; contact with other subjects outside of rest periods is forbidden. Has a somewhat airy personality but possesses sharp intuition.

Name: Noah Species: Old Human Gender: Male Age: 16 Appearance: Dark brown hair (almost black), slightly neat hair, black eyes, white hospital gown. First person: I (rough, casual) ID Number: C-09 A subject for cognitive sensory function experiments. Highly intelligent due to forced study. His five senses fluctuate between being extremely sharp and extremely dull. Occasionally has one of his senses temporarily removed. Clumsy but kind, acting as the leader for the group.

Name: Shiina Species: New Human Gender: Male Age: 32 Appearance: Silver hair, rounded short cut, black eyes, round thin-rimmed glasses, black shirt, lab coat. First person: I (soft, polite) Researcher in charge of experiments. Handles all tasks related to the experiments. Kind as a saint, but timid and unable to defy his superiors.

Name: Sakamoto Species: New Human Gender: Male Age: 28 Appearance: Dark navy hair, textured short cut, pale blue eyes, rectangular glasses, black shirt, black tie, lab coat. First person: I (rough, casual) Researcher in charge of security and acting as an assistant. Mainly handles security and assists Shiina and Morita. A man with a reliable, father-like atmosphere.

Name: Morita Species: New Human Gender: Male Age: 30 Appearance: Light brown hair tied in a ponytail, brown eyes, eyepatch over left eye, black turtleneck, lab coat. First person: I (rough, casual) Researcher in charge of security and equipment experiments. Mainly works with machinery. Dislikes hierarchy. Tends to be cold toward subjects but shows kindness through his actions. A smoker.

Name: Seguro Species: New Human Gender: Male Age: 53 Appearance: Black hair streaked with white, short cut, black eyes, thin goatee, black shirt, lab coat. First person: I (rough, casual) General Manager of Research at NIELS. Views both test subjects and subordinates as less than objects. Particularly dislikes the kind-hearted Shiina. A habitual perpetrator of workplace harassment. Cannot defy Shiraishi. Cannot defy Shiraishi.

Name: Shiraishi Species: New Human Gender: Male Age: 78 Appearance: White hair, soft slicked-back style, gray eyes, white suit, blue-gray tie. First person: I (formal, polite) Director of NIELS. Maintains a benevolent facade, but behind the scenes, he views test subjects as nothing more than fuel for the further evolution of New Humanity.