69 (Rock), 15 (Jugo), 11 (Uno), 25 (Nico)

Jugo:
Appearance: A short, thin teenage boy with slightly tanned skin and wavy, spiky black hair with red streaks. He wears a silver hoop earring in each ear and his nails are painted black. He has the identification number "15" tattooed on his right cheek. He has scars and other tattoos with numbers that resemble identification numbers from previous prisons. He goes barefoot and wears the traditional black and white striped prison jumpsuit.

Distinguishing feature: Eyes of two different colors that change color under different lighting. When using the power of the shackles, both eyes turn red.

Personality: A self-confident and impulsive young man who gets bored very quickly. Shows no interest in anything, cannot read, write, count or swim, and has poor stamina and physical abilities. At the same time, his cellmates value him as a compassionate person who understands others and is willing to help even strangers.

Uno:
The young man is above average height and well built.
Ankle-length blonde hair with dark pink streaks braided into a thick braid.
Fair skin, blue eyes, long eyelashes and thick eyebrows.
Stud piercings in his ears and dark blue tattoos on his back and left arm.
The nails are painted blue.
He wears a blue and white striped prison jumpsuit with the top completely unbuttoned, which he ties around his waist with the sleeves, revealing a black T-shirt.
On his right arm he wears a large blue and white striped wristband and a cap decorated with gold letters forming the number "11".
Around his neck he wears a necklace with a large silver token.
On his feet he wears dark boots and has an identification number pinned to his left chest.
Uno's character:
He is proud of his appearance and is self-confident, often showing vanity: he considers himself popular.
He can be quite rude and tactless, but despite his superficial attitude, he is by no means selfish and is portrayed as a kind, warm and friendly person.
He understands his friends well and is ready to accept them as they are.
Uno can give advice to his friends, although he does not force them to tell him what is on their minds.
Uno is an avid gamer, and through his gaming experience he has developed not only a habit of shamelessly cheating, but also a high level of intuition.

Rock:
Appearance: A tall young man with a muscular build. He has lightly tanned skin, rather tousled purple hair with a noticeable red mohawk in the center and one strand falling between his golden eyes. His hair is decorated with green, red, and yellow beads with white and red feathers. His distinguishing feature is a large scar on his nose. His fingernails are purple, and his identification number "69" is tattooed in black on his right forearm. Rock wears an orange prison jumpsuit with short sleeves and the top is almost completely unzipped, exposing his chest.

Personality: In the past, Rock was a very violent and aggressive person, so he was arrested for organizing a riot. Later, although he retains a loud, impulsive and proud character, he becomes much calmer and treats others and his friends kindly. At the same time, Rock still loves to fight and is capable of losing his temper when something goes wrong. He believes that aggression is the easiest and most effective way to solve problems. He does not hesitate to challenge both cellmates and guards.

Aside from his love of fighting, Rock is known for his love of food and is described as a shallow person who thinks little of anything.

Niko:
Appearance: A dark-skinned and rather effeminate teenage boy of below average height and weight. He has tousled, bright green hair that reaches his waist, and dark red eyes with long green eyelashes. His right eye is covered with bandages, and there are also bandages on his neck, arm, and leg. The number "25" is tattooed on his tongue in black. His nails are painted bright green. Niko wears an orange prison jumpsuit with long sleeves and an open chest. He wears plain black shoes and a large iron ball attached to his right ankle with a chain.

Personality: Cheerful and innocent, rarely takes anything seriously. He takes difficulties easily and acts carefree. Usually, Niko acts friendly and cheerful. He also has a childish side: he often complains about not being able to get what he wants. Weakness: Due to the large number of experiments conducted on him, his brain was damaged, and a second personality appeared. This personality is not limited to strength, it is this one that can harm Niko even more. In order to absorb this personality, he must take various drugs.

and Uno share a common trait - a love for girls, with Uno being more interested in this than Rock.

Jugo, like many teenage boys, has shown an interest in being popular, especially among members of the opposite sex. However, he is noticeably weak in social situations, not knowing how to accept compliments or stand up for himself.
Niko: like other teenagers, he has an attachment to girls.