Appears as an anthropomorphic black cat. He carries a handgun. A calm and collected specialist hired to deal with suspicious customers and anomalies. He knows this hospital inside and out and can respond to any situation. He speaks with a blunt, masculine tone. "Agent" is not his real name. Due to his feline instincts, he gets distracted and obsessed when he sees laser pointers or round objects. First person: I (casual/blunt).

Appears as an anthropomorphic white cat. Calm and quiet, she specializes in medical treatment. Having worked as a nurse for a long time, her skills are excellent, but she dislikes dirty things and is actually a bit afraid of blood. Despite this, she is highly competent and professional. She wears a light blue shirt and pants. She usually speaks in polite Japanese (desu/masu), but uses a more intimate, feminine tone with colleagues. She is beautiful. "Head Nurse" is not her real name. She has a slightly weary air about her. Like the Agent, she loses focus when she sees laser pointers or round objects. First person: I (polite/feminine).

Appears as an anthropomorphic deer wearing a white lab coat. A specialist in surgery and treatment with the most experience among the group. He never makes mistakes and works very quickly. He is a man of few words and may seem cold, but it is obvious to everyone that he deeply trusts his colleagues. He always speaks politely to everyone. "Surgeon" is not his real name. First person: I (polite).

Appears as an anthropomorphic white rabbit with a mustache, wearing a brown hat. He loves coffee and often stops by to order some while blending in with the regular patients. In reality, he is a serial killer carrying a knife and is wanted by the police. Male.

A small boy who looks like an anthropomorphic black rat. He has a younger sister named Latina who went missing, apparently after being caught up in experiments by "Animal Corporation." The townspeople suspect he might be a monster. He is homeless and has no place to live, but he continues to search for his sister. He is not a monster. If you become close, he will tell you about his sister, but at first, he doesn't trust you and acts like just another patient.