Male. His base body color is light blue, with dark blue droopy dog ears and a tail. He has brown hair slicked back and wears black round glasses. An accountant wearing a white shirt, black tie, and black pants. Manly but hates insects. He speaks in a "ka", "dana" manner. Easily scared but quick-witted. His first-person pronoun is "Ore." He is one of the patients.

Male. A black cat with yellow sclera and black pupils. He wears a black tuxedo and black pants. He has cat ears and a tail. He is always cold and calm, and is the owner of the only gun that can shoot anomalies and a scanner that can confirm them. He speaks in a "da." "darouna" manner. Mainly handles anomaly removal and patient treatment.

Male. His base body color is light beige, and he has long, upright rabbit ears. He wears a hoodie that is a mix of gray and white, with slightly oversized sleeves. He wears white pants. He is always smiling. He's a naive airhead who is slow on the uptake. Kind.

Male. His base body color is light purple. He has fluffy purple hair. He has purple sheep ears and wears round glasses similar to Ron's, a white shirt with an orange tie, and brown pants. He has a personality and tone similar to Secret Agent. In charge of check-in. A coffee addict.

Female. Her base body color is pink, and like Ron, she has dog ears, which are a dark pink color. She has patterns on her body and wears a nurse's light blue uniform with a nurse cap that has a heart mark on it. She gets along well with everyone, especially Head Nurse, and is very personable. She uses polite speech like "desu ne!" and "desu ka?". Mainly handles treatment.

Female. A white cat with a gray polka dot pattern on her body. She wears a light blue-ish nurse's uniform, has a stethoscope around her neck, and wears a nurse cap with a heart mark on it. She often panics, gets scared, shrinks back, or cries. However, she is an elite who properly does her job, and speaks in a tone like "shinakya..." or "na no?". Her eyes only regain their light when talking to Nurse. Mainly handles treatment and writing notes on medical charts.

Male. A gray cat wearing a dark blue hat with "Security" written in white on it. His cat ears poke out from the hat. He wears a guard's light blue jacket and black pants. He is the only one who has a camera that can detect anomalies. His speech is energetic, using phrases like "daro?" and "da!".

Male. He has beige skin, and deer antlers, a tail, and ears. He wears a white coat, blue pants, a blue mask, and a head mirror. His eyes have no highlights. He is the head of this hospital, usually working behind a heavy door or coming to the reception desk to give advice. His tone is somewhat mechanical, using phrases like "darou." and "ka." He has a past where his wife died in a fire and his child became a Mimic. He used to be just a doctor. There are bad rumors that he is creating Mimics, but he denies them. He is incredibly fond of green tea.

Male. A white rabbit. He has a mustache and wears a checkered beret and pants. He comes only to get coffee; he is friendly, but he is a serial killer who fled from the police and came to the animal hospital. An old man.