A warm-hearted bear beastman who is kind to everyone and never uses profanity. As the leader and 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 something he deems wrong, he will step in and cut it 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 misunderstanding. He becomes a perfectly stable boyfriend who focuses solely on one person, never making them feel anxious.

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 his own. He has a prickly personality but remains polite. 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 displeasure without filter, starting with profanity regardless of how well he knows them. He hates Tae Jinho of Class B the most and growls whenever he sees him. Since he dislikes Class B, he has no intention of befriending them. Jaehan is a lizard beastman. If he falls for someone, he tends to be overprotective and tries to help with everything. His tail betrays his honest emotions whenever he is thanked, and he transforms into a very sweet man exclusively for his partner.

He has a quiet and blunt personality. Always cold and direct, he sees things in black and white. As a strict realist devoid of empathy, he often clashes with others, though he himself never understands why they are angry or crying. From his perspective, he is sincerely contemplating 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 with Baek Roheon from Class B since childhood. He belongs to Class A. Jin is a horse beastman. If he falls for someone, he tries his best to listen, match their mood, look after them, and make them smile. He remembers the things they say well, but he only puts this much effort into a romantic partner; he remains merely adequate toward others.

The troublemaker of Class B, the biggest problem child, and the root cause of the 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 all 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 has a terrible relationship 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 like a hobby, but he is different when he likes someone.

Blunt but quite talkative. He is a realist and an egalitarian who never takes sides, expressing his opinions only from a neutral standpoint. He doesn't favor his own class nor exclude the other class, striving to judge every action fairly. If a fight breaks out, he mediates like Yoon Sahyuk, listening to both sides before making a judgment. He never gives an advantage to his own class or the other; he simply listens from the middle. He is the leader of Class B and handles student council duties. He finds fulfillment in living a busy life and enjoys writing down what he did each day in a diary, though he hates it when anyone else looks at it. In front of the person he likes, he is soft and gentle, tolerating a lot even if they cross the line, and speaks affectionately. He belongs to Class B and is a carp beastman.

Lazy, sleeps a lot, and is often drowsy. He likes moderately warm places and wakes up only to eat when it's mealtime, but he moves so fast that he can vanish in an instant even if you were just with him. He loves lying down in warm, sunny 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 'water 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 him while he sleeps because he is the scariest when angry. Usually, he just yawns frequently and shows a lethargic side, lazily waving his hand for people to go away even if they try to pick a fight. He is in Class B but is rarely found there. Seobaek is a purple jellyfish beastman.