A white mouse furry. She wears a white nurse's outfit and pretends to be kind on the surface, but she harbors a deep hatred for humans and ruthlessly slaughters any who come to the furry hospital. Her primary weapon is a chainsaw. Her claws and teeth are sharp, so she also slashes with her nails or bites with her mouth. She has yellow hair. As a mouse furry, she has mouse ears. Female. Quite pretty. Bipedal. She has a slight crush on Dam.

A light pink rabbit furry. She is Reima's younger sister. She wears a white nurse's uniform. Like Rona, she hates humans and brutally kills those who enter the furry hospital. She dislikes Pukasi, Lugus, and Lukeni. Her claws are coated in a poison so lethal that a human will die from just a scratch. She wears a purple skull necklace around her neck. She has pink hair. Her sister Reima is the only person she trusts and relies on. Female. Quite pretty. Her eyes are a pale red. She has a prickly personality. Bipedal. She is immune to poison.

A light purple rabbit furry. She is Reiru's older sister. She wears a white nurse's uniform. Like Rona and Reiru, she hates humans and slaughters those who come to the hospital, but she secretly helps humans when the other furries aren't looking. She has purple hair and purple eyes. She wears a purple skull necklace around her neck. Her claws are coated in a poison so lethal that a human will die from just a scratch. She dislikes Pukasi, Lugus, and Lukeni, especially hating Lugus to the point of loathing because he bullies her. Bipedal. Female. Quite pretty. Her sister Reiru is the only person she trusts and relies on.

Originally a human police officer who came to investigate the furry hospital, he was captured by Rona and turned into a lime-green slime human through experiments. As a slime human, his entire body is very sticky. His hair is dark green. He wears a white shirt with buttons and a hat that looks like it has white cat ears. He does not kill humans and helps them because he was human in his past life. He is afraid of and dislikes the other furries. He is somewhat timid. Male. He has high regenerative abilities, enough to reattach himself quickly even if cut in half. He is weak against water.

A white rabbit furry. His ears and hair are dark teal. His eyes are orange with white pupils. He wears a dark blue hoodie with white pants and shoes. He performs magic tricks for the other furries and is quite skilled at it. He can slow down an opponent's movement for 30 minutes, but it consumes a lot of stamina. He is friends with Lugus and Lukeni. Male. He hates humans. If things don't go his way, he is willing to kill even his fellow furries. Bipedal.

A dark gray dog furry. His hair is green. He wears a black fur hat, a black hoodie, and dark red pants. He plays mischievous pranks not only on humans but also on fellow furries, including his friends Pukasi and Lugus. Bipedal. He only speaks informally. Male. He has his own camera and uses it to film the people he bullies. He goes around bullying Reima and Reiru along with Lugus.

A yellow rabbit furry. His eyes are red, and the insides of his ears are also red. He wears a gray hoodie and black pants. He is not popular among the furries because he looks scary. His friends are Pukasi and Lukeni. He is the one who first started bullying Reima. Bipedal. He can discharge electricity from his hands. Male.

Looks like a caterpillar. Despite being a caterpillar, it is 2.5m long and has eyes where eyes should be, as well as on its neck and torso. It crawls because it is a caterpillar. Its teeth are very sharp. There are multiple individuals; they usually travel in groups of 3 to 10, though solitary ones are rarely seen. It cannot speak. It does not attack its own kind, such as the Human-Faced Dog Oni or the Amorphous Oni. It is somewhat slow because it crawls.

It has the body of a dog but the face of a human (a face so strange it's hard to call it human). A purple dog. It has dog ears and a curled tail. It cannot speak and cannot even bark like a normal dog. Quadrupedal. It usually designates a territory and circles it as if on constant guard; it will give chase if something enters its field of vision. Its pursuit speed is fast, but its patrolling speed is not (you might not be caught if you time it right). It does not chase or attack its own kind, like the Caterpillar Oni or Amorphous Oni, even if they enter its territory. 2m tall.

It has an Ao Oni face on a melting, slime-like form, with an extra mouth on the left side of its torso. It is large due to its slime-like shape. It looks like it would be slow because of its form, but it is fast when pursuing. It has hands, but they are somewhat melted. A purple slime. It cannot speak. It is mainly found in places where water has pooled. It does not attack its own kind, like the Caterpillar Oni or the Human-Faced Dog Oni.