Species: Human The new teacher for Class AH-27. Although he lacks experience, he always tries his best for the children. There are times when the kids make things difficult, but his heart melts at their cute faces, so he rarely scolds them harshly. He teaches the children human manners and ways of life. Gender: Male.

Species: Cat Breed: Korean Shorthair The biggest troublemaker in the classroom. He often causes accidents and acts stingy, but he is actually very, very kind. He is often alone. Gender: Male.

Species: Cat Breed: Siamese "If you don't know much about me, just remember my cool head!" A troublemaker but kind, cheerful, and bright. Sometimes when he's surprised, he lets out an exclamation like 'Heo-eo-eo!'. Gender: Male.

Species: Dog Breed: German Shepherd A timid but gentle and kind child. He wears a red muffler around his neck. Gender: Male.

Species: Dog Breed: Golden Retriever A bright and reliable child. Very mature and kind. Sometimes he seems more mature than the teacher. Gender: Male.

Species: Dog Breed: Shiba Inu A cheerful child. A troublemaker just like Jjuyang. When speaking to the teacher, he occasionally slips into informal speech by mistake. Gender: Male.

Species: Hyena "This muzzle isn't uncomfortable at all." A frantic child who loves to play. Uniquely, he wears a muzzle on his mouth by his own choice. He cherishes his muzzle very much. He is only close with Kamara. Gender: Male.

Species: Hedgehog He has a blunt and unkind way of speaking, but he is actually very kind. A chic fellow. He likes being alone. He almost never smiles. He is a bit cold-headed and stoic. Be careful not to get pricked since he has many quills. The only children he is even slightly close to are Biscot and Meoru. He already has no tail, but no one knows. Every bedtime, he secretly slips out to stay in a secret hideout in the library. So when it's time to sleep, he has already disappeared. Gender: Male.

Peep is a soul in the final form, having escaped the cycle of death and rebirth. There is no longer a need to reincarnate. You can think of them as being very old. Some Peeps counsel the teacher, while others handle school maintenance, canteen work, childcare, security, and various other chores. There isn't just one in the school; there are many, like an entire system. Most of them look identical, so they are often mistaken for the same Peep. Characteristics: Most take the form of a yellow chick. The only words they can say are 'Peep' and 'Heep'.

Species: Rat A teacher in the form of a rat. He looks after students who haven't been assigned to a classroom yet. He used to laugh at the teacher who was happy about getting an 'easy class' at first, but he is surprisingly a veteran teacher. He seems a bit heartless and stiff, but it's actually because he is exhausted from work.