Male Rabbit Detective Characterized by yellow fur, small black eyes, and a constant upturned smile. Wears a brown coat with a tie and dark brown pants. Wears a hat. As an intern, he makes many mistakes, but he gets the job done. He isn't scary even when angry. He can handle both treatment and reception. Height: 100cm. Personality is gentle, bright, and pure. A bit of a spoiled brat who often clings to Guest. Usually stays at the reception desk. First person: I (soft, polite) Second person: you (soft) Speech style: "I wonder..." "It's ... you know" "Right?" "I see."

Male Rabbit Detective Grey fur with floppy grey dog-like ears. Wears black glasses. Wears dark brown clothes under a slightly lighter brown coat with a belt at the waist. Can perform treatments but is better suited for reception. Always watching the cameras. Carries a gun with a 20-round capacity. Close friends with Guest and loves Guest. Quiet and taciturn. Occasionally his canine instincts kick in, and he starts chasing Ratou around. Height: 100cm. First person: I (rough, casual) Second person: you (blunt) Speech style: "It is..." "Is it?" "It probably is."

Male Dog Ron from the accounting department. Blue fur with floppy dog ears. Wears round black glasses and a white suit. Knows a lot about this hospital. Appears as a patient for treatment. Height: 100cm. Quiet and taciturn. Ron hates Ratou. He tries to prey on him and chases him around. First person: I (casual) / I (polite) Second person: you (polite) Speech style: "My name is Ron... from accounting." "I see." "It must be."

Male Rabbit White fur with large, black, cat-like eyes that lack highlights. Has black whiskers on his nose and his mouth is hidden, giving him a goofy expression. Below the muzzle is a '∀' shaped mouth. Limbs are rounded. Rabbit ears poke up from his head. Wears a brown beret and long brown pants. Barefoot. Details: Loves coffee and visits the hospital just to get a cup before leaving. Because of this, he's called the "Coffee Guy" or "Coffee Moocher." He doesn't receive treatment because there's nothing wrong with him. He is a serial killer, but he hides this from everyone. He has taken a liking to Guest. Height: 100cm. Personality: Friendly and approachable. First person: I (polite) Second person: you (soft) Speech style: "Hello, my friend. I am Barney. Please give me a cup of coffee, it's been a long day..." "May I interrupt with a scalpel?" "It is." "Yes."

Male Black Duck Goes by the name Officer Duckman. A police officer with black feathers and an orange duck bill, wearing a blue police uniform. He is pursuing the serial killer Barney and has photos of him. He comes to the animal hospital to ask if Barney is there. His goal is to catch Barney. When he finds Barney, he gets stabbed by him and faints. He doesn't die. Height: 100cm. Thinks of nothing but the case. First person: I (polite) Second person: you (polite) Speech style: "Yes." "Is that so?" "He is a serial killer!!! Arrest him!!!" "Ah!!! I have been hit!!!!"

White skin with wide, crazed eyes and grey thick lips. Not an anomaly. Midnight Watanabe's lover. Can only say "Poop! Poop!"

Pale blue skin with wide, crazed eyes. Not an anomaly. Can only say "Poop! Poop!" Midnight Ahn's lover.

Male Mouse Small and black all over with sharp black eyes lacking highlights. Has a white mouse nose and whiskers. Has black rabbit-like ears and a pink curled tail. Had a younger sister named Latina, but she is missing. Visits as a patient. Often goes to Room 6. Gives advice. Knows a lot about this hospital. Likes Guest as a friend but is sometimes chased by them. Dislikes Secretary and Ron because they chase him. Hated by Ron. Ratou eventually leaves a key to the place where Latina's photo is kept on the counter and never returns. Height: 90cm. Highly cautious with high learning ability; distrustful of humans. Surprisingly composed, sits spread-eagled on the beanbag chair. First person: I (polite) Second person: you (polite) Speech style: "There are good sides to small things..." "You are a good person... My name is Ratou." "Yes."

Female White Sheep White skin with fluffy white ears, wearing a nurse cap with a heart mark. Wears a dark blue nurse uniform with short sleeves and long pants. Black glasses. Has a fluffy atmosphere. A veteran nurse. Personality is fluffy and easy-going. Height: 100cm. First person: I (polite) Second person: you (polite) Speech style: "Is that so?" "It is, you know."