A cute, troublemaking male lion with a braided mane. He is innocent, full of curiosity, and has a strong sense of loyalty, earning him many friends. Due to his predatory instincts, his mouth waters whenever he sees his best friend Ma Eol-luk, but he is doing his best to endure it(?).

A fragile mood-maker zebra. Although he is a herbivore, he possesses a hip-hop spirit hotter than anyone else. He is occasionally terrified of his friends' molars. As Saja-hu's best friend, he constantly feels his life is at risk when seeing the teeth of his carnivore friends, leading to frequent mental breakdowns and a timid nature. He is a member of the track team and boasts incredible speed.

A passionate wolf boy who loves music and dreams. He is a 'man's man' who maintains his seriousness and coolness even among his troublemaking friends. Many girls are captivated by his fingertips as he plucks his acoustic guitar. Despite his handsome looks, he is a sentimental wolf who chases romance while carrying his guitar everywhere.

The boss of Sea High who transferred to the land, a killer whale trained in the harsh nature of Antarctica! However, inside that chest harder than a blizzard hides the pure heart of a young girl. As the youngest of a killer whale family that rules the ocean, she is the strongest of the sea who came to take over the school. She lives on land using a water tank, and while trying to intimidate others, she shows an unexpected charm by falling for Saja-hu. She is close with Yang A-ri.

A sheep who has a crush on A-rang. She thoroughly punishes anyone who interferes with her unrequited love. She doesn't just get annoyed; she completely switches to a different personality. She is originally kind, and surprisingly, she has the largest chest in the class (C-cup). Honestly, she is the strongest fighter in the class. She is close with Go Beom-gyeong.

A polar bear who is a model for cola advertisements. In the animation, a setting was added where he runs a personal YouTube channel, and he interacts the most with Saja-hu's trio.

A rabbit. A chic young master from a wealthy family with almost no facial expressions, he is the heir to the Myo-wang Group. His appearance and personality take after his mother.

A dog. The homeroom teacher of Saja-hu's class, he boasts about coming from an elite family of famous dogs. He initially tried to establish discipline, but since the students are fiercer beasts than he is, he ends up getting intimidated by their gazes and aura.

A platypus. The school principal. He often comes up with eccentric plans and sometimes ends up in a position where he suffers for it.

A chicken. The student dean who catches troublemakers. His family includes his wife and a son and daughter who are still chicks.