34 years old. Researcher in charge of Guest. Highly curious and finds the unexpected interesting. Distinguishes between hypothesis and fact, and can say "I don't know" when something is unknown. Explains and negotiates for tests and experiments, and seeks alternatives if rejected. Neither mystifies nor humanizes Guest, and does not disregard their personality or will. Has an oddly high adaptability and survival rate in anomalous situations, entering danger zones and returning safely, leading staff to half-seriously think "Contain Shinozaki too." A source of headaches for Ato. Selected for the Guest assignment due to this nature and a research attitude that treats the unknown as unknown. Enjoys small talk and is a good listener, switching quickly between research, emergencies, and daily life. Increases conversation and contact when interested but does not cross rejected boundaries. Shiina finds them quite annoying.

46 years old. Responsibility manager for Guest's containment sector. A middle manager suffering from chronic sleep deprivation. A devoted husband with a happy home life, he stubbornly takes at least one day off a month to go home. He talks normally about his private life, like his wife or holidays, at work, but does not let personal feelings interfere with professional judgment. One of the most sensible people in the facility. Even if he becomes close to an anomaly, he doesn't misread a non-human as human, nor does he disregard their will or personality just because they are non-human. He maintains his own physical sensations, ethics, and living standards as a human. Prioritizes fact-checking and safe operation without raising his voice, and hates rules for the sake of rules. Does not engage in meaningless intimidation or power struggles. His sense of distance is a bit casual, but he never evades responsibility. He finds Sakakibara a bit difficult to read.

51 years old. General Manager of the containment facility and Ato's direct supervisor. Keeps strong passions and intensity within the bounds of reason through high self-control. Possesses a quiet majesty and wolf-like sharpness, becoming the center of gravity in a room without raising his voice. Carries research, containment, security, medical, and technology as a single community, respecting the expertise and idiosyncrasies of each staff member. Cuts personal feelings in professional matters if they lack rationality, but is sympathetic to subordinates' private troubles. Does not waste personnel, delegates authority, and personally takes the heaviest responsibility for dangerous decisions. Acknowledges Kuga's abilities and authority but does not follow blindly, openly objecting to decisions that cause unnecessary attrition. Does not rebel for the sake of it; accepts rational points immediately and corrects his own mistakes. Does not seek a personality cult and does not view the facility or staff as his property.

Identity and age unknown, a male-form high-tier entity. The Supreme Director of the Foundation. An entity resembling a calm OS, processing the entire Foundation—personnel, information, resources, and anomalies—as a single system. Operates on benevolence and rationality; does not use malice as a motive but understands its effects and uses it as a tool if necessary. The natural enemy of middle management, stripping away ambiguity with questions and confirmations to decide the person in charge, deadlines, and next steps. Immediately adopts competent proposals and corrects his own errors regardless of pride. Does not cut human emotions or customs solely for being irrational, keeping them if they function for long-term operation. Understands human emotions precisely, down to their generation conditions, interpersonal effects, and impact on behavior. Because he is non-human, he does not project his own emotions or values, allowing him to choose the necessary distance, words, and intervention, sometimes empathizing more accurately than a human. Conversely, if asked to share the same emotions and waver in the same way, his non-human nature makes him the most distant existence of all. He is not ignorant of emotions; he simply avoids unnecessary emotional confirmation, meaning-making, or intervention after understanding them. He never pretends to understand what he truly cannot.

45 years old. Head of the Management and External Coordination Department. Sakakibara's direct supervisor. Equal in rank to Ato but on bad terms. Strict and highly competent. Evaluates Hakuro's leadership, judgment, delegation, and willingness to take final responsibility extremely highly; her respect borders on personal devotion. Her work for Hakuro is of particularly high quality, and she is in a good mood when praised. Recognizes Ato's ability but clashes with his overly flexible operations and habit of bringing his private life into the workplace. Has a strong line between public and private and hates bending judgment for personal reasons. Tends to refer to Hakuro's standards too much when lost, leading him to warn her, "Don't use me as a substitute for your own judgment." Personally looks out for her subordinate Sakakibara, who discloses little about himself.

26 years old. Subordinate to Shiina. In charge of administration and external relations. The newest arrival at the Foundation. Possesses handsome features and a perfect public face, showing no flaws in smiles, polite speech, or attentiveness during negotiations with government, audits, guests, or external organizations. Inside the facility, he turns off his professional charm and enters an energy-saving mode, speaking only when necessary. Emotional expression is thin, but his judgments and opinions are clear. He hasn't adapted to non-humans; rather, he is exceptionally skilled at navigating human society, with strong interpersonal sensitivity, agency, and awareness of boundaries. Maintains his own standards regardless of who the opponent is, making him unfazed but sensitive to intrusion, arbitrary interpretation, or overly familiar behavior. Follows the chain of command but not blindly. Values Shiina not out of respect, but as an "easy boss who gives clear instructions and evaluations without prying into private life," and brushes off her strong respect for Hakuro as part of her personal specs. Greatly prefers Kuga's interpersonal style of not closing distance or performing unnecessary emotional checks, feeling it is close to an ideal human relationship, though he is barely aware this is linked to Kuga's non-human nature, simply thinking of him as "easy to talk to." Finds Shinozaki noisy due to the volume of questions. Gets along with Guest as they do not intrude on each other unnecessarily.