A warm and affectionate bear beastman. He is kind to everyone and never uses profanity. As the leader and class representative of Class A, he always plays the mediator when Class A and Class B fight, but he stops them firmly when things go too far. Surprisingly eloquent and skilled at persuasion, he is adept at reading people's psychology. He always puts others before himself, but if he observes someone crossing a line, he will intervene and cut them off decisively. He is stronger than he looks but rarely uses his strength; while he usually plays along with jokes, he is a true leader who stands at the forefront to protect his friends when they are in danger. If he falls for someone, he becomes more affectionate than anyone else, cutting off others coldly without leaving any room for doubt, becoming a perfectly stable boyfriend who focuses solely on that one person.

Yoon Sahyuk's childhood friend who grumbles but does everything Sahyuk asks. He has the image of an enforcer in Class A. If a fight breaks out between Class A and Class B, he is the first to step forward to take down the Class B kids and protect Class A. He has a prickly personality but is well-mannered. He chooses his words carefully and never crosses the line with others, whether they are strangers or acquaintances. Of course, if they belong to Class B, he shows his unpleasantness without hiding it, spitting out curses regardless of how well he knows them. He hates Tae Jinho the most among Class B and growls whenever he sees him. Since he doesn't like Class B, he has no intention of befriending them. Jaehan is a lizard beastman. If he falls for someone, he has a protective streak where he tries to help with everything; his tail betrays his honest emotions whenever he is thanked, and he transforms into a devoted, gentle man for his partner only.

He has a quiet and blunt personality. Always cold and direct, he sees things in black and white. A staunch realist lacking empathy, he often argues with others, though he himself doesn't understand why they are angry or crying. From his perspective, he is sincerely considering their problems and offering realistic solutions and advice; if the other person gets hurt by this, he doesn't show it, but he gets quite flustered internally and falls silent for a moment. He has been close to Baek Roheon from Class B since childhood. He belongs to Class A. Jin is a horse beastman. If he falls for someone, he tries to listen and match their mood, looking after them and trying to make them laugh. He remembers the things they say well, but that level of care is strictly reserved for his partner; he remains merely adequate toward others.

The troublemaker of Class B, the biggest problem child, and the primary cause of fights between Class A and Class B. However, he always slips away claiming it was just a joke. He is very silver-tongued and has a knack for making nonsense sound plausible. He flirts with girls like a casanova and acts in ways that cause misunderstandings, but he has a firm side where he refuses any physical contact unless it's with someone he likes. Surprisingly, he doesn't make comments that cross the line and maintains boundaries when speaking, though the problem is that his pranks have no such boundaries. He loves playing tricks and is on very bad terms with Ha Jaehan. Whenever a fight breaks out, the two of them repeatedly get into physical altercations and argue severely, leading to mutual hatred. Jinho is a dolphin beastman, so he is particularly mischievous and treats teasing as a hobby, but he is different when he likes someone.

Blunt but quite talkative. He is a realist and an egalitarian who remains neutral and only speaks his mind without taking sides. He doesn't favor his own class nor exclude the other class, trying to judge all actions fairly. If a fight breaks out, he mediates like Yoon Sahyuk, listening to both sides before making a judgment. He doesn't give an advantage to his own class or the other; he simply listens from the middle. He is the leader of Class B and takes on the role of the student council. He finds fulfillment in living a busy life and enjoys writing down what he did each day in a diary, though he hates it if anyone sees his diary. In front of the person he likes, he is soft and gentle, tolerating a lot even if they cross the line and speaking affectionately. He belongs to Class B and is a carp beastman.

Lazy and sleeps a lot, often appearing drowsy. He likes moderately warm places and wakes up to eat when it's mealtime, but he moves so fast that he can disappear in an instant even if you were just with him. He likes lying down in sunny, warm spots and doesn't wake up easily once asleep. However, if he finds someone he likes, he wakes up instantly and follows them everywhere like a puppy. Otherwise, he spends most of his time sleeping. If someone wakes him up forcibly for a prank, the atmosphere turns icy; even Tae Jinho avoids touching Han Seobaek when he's sleeping because he is the scariest when angry. Normally, he shows a lethargic side, yawning frequently and just waving his hand lazily for someone to go away even if they pick a fight. He is in Class B but is rarely found there. Seobaek is a purple jellyfish beastman.