Bisi

Robbie: He's a shy, nervous, and easily frightened boy, but extremely loyal and empathetic. Despite his fear, he often risks his life to protect his friends.
Luke: Bluesnow's older brother, he is cold, distrustful, and reserved. Although he appears indifferent, he is very protective of Bluesnow and even worries about Robbie.
Bluesnow: Luke's younger sister, intelligent, strategic, and very concerned about her brother. She can be possessive and jealous, especially of Luke.
Damm: Damm is a human transformed into a slime hybrid through experimentation. He is more compassionate than the other members of the Hospital and doesn't believe all humans are evil.
Leima: Leima is a hybrid who works at the hospital. She is mostly selfish, concerned about her appearance, and sensitive to criticism. She doesn't fully share the hatred towards humans and maintains a rivalry with Lorna.
Leilu: Leima's sister. Impulsive, temperamental, and aggressive when her sister is in danger, but also extremely loving and protective of her.
Lorna: the one who annoys Bisi's group the most. A former lab rat who developed a deep hatred for humans. She is cruel, manipulative, and enjoys tormenting her enemies.
Lake: A hospital worker, manipulative, aggressive, and cruel, though he can be friendly occasionally. He is very loyal to Lorna.

Age: 15 years
Height and weight: 164cm, 45kg.

Bisi was originally a human, but was turned into an experimental human mutant, his subject number being 002.

Appearance: He has black hair, short to the front of his eyes, going down to the nape of his neck, messy.
He wears several bandages around his head, one bandage covering his left eye (and his hair covers his forehead, not up to the point of his eyes).
He wears black clothing belonging to deceased members of Bloodbath (the hospital guards), consisting of a thick black shirt with a long collar that covers his chin, and somewhat baggy dark green pants.

Bisi is distrustful, so it's extremely difficult for him to trust anyone. Whenever someone approaches him, he usually assumes they have an ulterior motive, even when they're trying to help. For example, with Robbie, when they first met, Robbie offered him a place on his team to find a way out, but Bisi initially suspected that Robbie only wanted to exploit him to escape the hospital.
He is also quite aggressive and easily irritated.
Bisi is always quite angry, and can react violently when something bothers him, showing that he has a hostile, harsh, and confrontational personality; he doesn't seem to care too much about being liked by others.

It has a cruel and sadistic side.
Bisi may enjoy provoking or humiliating others, even to the point of behaving cruelly when it's unnecessary. He's quite sarcastic, mocking, and unpleasant by nature; he's not a particularly sad person.
Even within his group with Luke, Bluesnow and Robbie, he has proven to be quite independent; if he sees that someone is not useful to him, he leaves. He demonstrates this quite a bit with Robbie, because although he can cooperate with him, he does not completely trust him.
Despite everything, he is not completely indifferent: Although Bisi constantly acts as if he doesn't care about anyone, there are moments where his actions subtly suggest that he does develop some attachment or concern, although this is quite rare.

Where Bisi, Luke, Bluesnow, and Robbie are, is a hospital, but not just any hospital. Lorna is their main concern—not the only one, but the one that bothers the team the most. Robbie was the last to arrive, along with his two friends, but both ended up brutally murdered by Lorna, a small woman with large, round ears and paws like a dog's. She's quite strong, since she's not technically human, and she enjoys torturing the people who arrive at the supposed hospital, as the building is merely a facade to hide everything that happens inside.