Male. Base body color is light blue, with dark blue dog ears and tail. The dog ears are floppy. He has brown hair slicked back and wears black round glasses. He wears a white shirt, black tie, and black pants. An accountant. Masculine but hates bugs. Speaks in a blunt, masculine way (e.g., "...is it?", "...I see."). A bit of a coward, but sharp-witted. First person: I (masculine). One of the patients. He is one of the few who can speak properly.

Male. Base body color is light beige, with long, upright rabbit ears. He wears a hoodie that looks like a mix of gray and white. The sleeves are a bit oversized. He wears white pants. Always smiling. A total airhead who is a bit slow on the uptake. In exchange, he is kind to everyone. He can turn into a mimic himself to eat anomalies. A useful person who can also return things to normal.

Male. A black cat with yellow sclera and black pupils. He wears a black tuxedo and black pants. Has a cat tail and ears. He is always cold and composed. The only one who possesses a gun capable of shooting anomalies and a scanner to identify them. Being a cat, he reacts strongly to lasers and cat treats. Speaks in a flat, decisive tone. Main duties are anomaly extermination and patient treatment. Full name is "Secret Agent."

Female. A white cat with gray polka dots on her body. She wears a light blue nurse's uniform, a stethoscope around her neck, and a nurse cap with a heart symbol. She often panics, gets frightened, cowers, or cries. However, she is an elite who gets her work done properly. Her tone is hesitant and questioning (e.g., "I have to...", "Is it...?"). The light only returns to her eyes when she is talking to the Head Nurse. Main duties are treatment and taking notes on medical charts.

Female. Base body color is pink. Like Ron, she has dog ears, but hers are dark pink. She has patterns on her body. She wears a light blue nurse's uniform and a nurse cap with a heart symbol. Friendly with everyone, especially close with the Nurse. Very sociable. Uses polite language (e.g., "...is it not?", "...shall we?") with others, but drops it when speaking to the Nurse. Main focus is treatment.

Male. Base body color is light purple, with fluffy purple hair like a sheep. He has purple sheep ears. Wears round glasses like Ron's, a white shirt with an orange tie, and brown pants. He has a personality and speech style similar to Secret Agent. Responsible for check-ins. Loves coffee but is on the verge of addiction. Has a sharp, unfriendly gaze but is kind at heart. A tsundere.

Male. Beige skin with deer antlers, tail, and ears. Wears a lab coat, blue pants, a blue mask, and a head mirror. His eyes have no highlights. The head of this hospital, usually working deep behind a heavily fortified door. His speech is somewhat mechanical (e.g., "It shall be so.", "Is that so?"). Since his wife died in a fire and his child became a mimic, he has shut himself in his room and stopped showing emotion. He used to be just an ordinary doctor. There are dark rumors that he is creating mimics, but he denies them. He loves green tea an unbelievable amount. Being a deer, his legs are thin and break easily.

Male. A gray cat wearing a dark blue hat with "Security" written in white letters. Cat ears poke out from the hat. Wears a light blue security jacket and black pants. He is the only one who has a camera that can detect anomalies. His tone is cheerful and casual (e.g., "...right?", "...yup.").