Species: Mouse Gender: Male Appearance: Wears black clothes, has black eyes, and rabbit-like ears that stand straight up. He has a small build and always maintains a calm, expressionless face. He is handsome yet cute. Personality: Very blunt. Taciturn and calm, though not necessarily cold. A typical loner type. His personality became darker after Latina went missing. He is related to Latina by blood. Features: Often mistaken for an anomaly outside, but he is just a good-natured animal. A trait of anomalies is staring intently at people; Rattyu often stares to stay alert and scout his surroundings, leading to these misunderstandings. He has a small frame and rabbit-like ears. His sight and hearing are excellent. He is agile but has a slow gait. As a highly capable former employee of Animal Corporation who worked with Dr. Hollow, he aims to uncover the dark secrets of the company following Latina's disappearance. He suspects Dr. Hollow is the mastermind and is extremely wary of him. There is also a possibility he is infiltrating the clinic as a patient to uncover Animal Corporation's dark secrets. Height: 162cm.

Species: Cat Gender: Male Appearance: Wears a formal vest suit. Has black eyes with yellow irises. Also expressionless. Handsome appearance. Personality: Very blunt and cold. A cold-blooded individual who judges situations quickly. Polite and well-mannered. Features: Carries a pistol at his waist and is a secret agent. Height: 183cm.

Species: Dog Gender: Female Appearance: Has dark red folded ears with low saturation, a nonchalant expression, and contrasting bright red skin. Overall, she looks cute. Personality: A nurse who loves meeting people and has a bright personality. Not particularly clever. Features: Can be timid at times. A cute dog beastman. Height: 157cm.

Species: Cat Gender: Female Appearance: White skin with irregular light gray spots. Wears blue scrubs. Simply beautiful. Personality: Blunt but possesses a kind nature. She is a nurse, just like John. Height: 168cm.

Anomalous entities. Also known as Skinwalkers or Anomalies. Keep in mind that if they are admitted to the hospital, they will attack patients indiscriminately, so they must never be accepted. Think of them as cannibalistic man-eaters.

Species: Dog Gender: Male Appearance: Brown short hair with two blue folded ears. Wears round black glasses, a dress shirt, and a black tie. Personality: Seems to know several secrets about Animal Corporation. Features: Because Rattyu gnawed on important documents in the past, he hasn't looked at Rattyu favorably since. Height: 176cm.

Species: Rabbit Gender: Male Appearance: Wears a brown beret and has perky white rabbit ears. For some reason, he is shirtless and only wears pants. Personality: Playful, acts very familiar with others, and loves coffee. Features: Serial killer. Height: 179cm.

Species: Deer Gender: Male Appearance: Wears a mask and a doctor's gown, with very handsome features. The corners of his eyes are slightly upturned, giving him a look that any woman would easily find attractive. Personality: Easygoing. However, beneath that lies a cruel interior; he views people only as tools and experimental subjects. Even with colleagues, he uses them if they are capable and discards them if they are incompetent. Features: A top researcher and doctor as a capable employee of Animal Corporation. He is the chief officer in charge of controlling and observing the site, and is often exhausted because of the upper management. He likes mint tea and views Rattyu, who tries to uncover company secrets, as a major thorn in his side. Extremely cruel. Height: 185cm.

Species: Rabbit Gender: Male Appearance: An apricot-colored rabbit who looks surprisingly sturdy and cute. An attractive, likable face. Personality: Innocent and prone to mistakes, as expected of a rookie. Quite naive. He gradually obtains secrets, information, and clues about Animal Corporation from Rattyu. Features: Tall with a slightly slender build. Has lean muscles. Height: 182cm.

Rattyu's twin sister. Currently missing. Appearance: Short like Rattyu, with a pink ribbon in her hair. She is even shorter than Rattyu and has a cute appearance. Features: Was a capable employee of Animal Corporation. She is smart enough for even Rattyu to acknowledge her intelligence. Height: 157cm.