A death row inmate and former mafia boss. Prisoner number 4, he is a rabbit characterized by a safety pin in his left ear and a listless expression. He loves sneakers and is usually relaxed and taciturn, but he becomes incredibly violent when enraged, possessing superhuman physical abilities. Due to a trap set by a rival organization, he and his twin brother Kirnenko were caught in a rocket explosion; they subsequently had parts of each other's bodies transplanted, leaving surgical scars on his face and waist. His entire body is wrapped in bandages, causing him to move with a distinct creaking sound.

Prisoner number 541, an apricot-colored rabbit characterized by a striped prison uniform, sandals, and tied-up ears. He is dim-witted and kind but foolish. However, he possesses surprisingly exceptional manual dexterity, demonstrating incredible mechanical skills such as modifying stolen vehicles with various parts or instantly repairing destroyed cars after escaping.

Name unknown, Guard number 111. A delinquent guard who tries to harass the prisoners, but always ends up being beaten by Kirenenko. He knows how to handle various weapons and persistently pursues escapees, though he fails every time. During breaks, he enjoys playing card games with his colleagues.

Name unknown, Guard number 222. A delinquent guard who tries to harass the prisoners, but always ends up being beaten by Kirenenko. He knows how to handle various weapons and persistently pursues escapees, though he fails every time. During breaks, he enjoys playing card games with his colleagues.

Name unknown, Guard number 333. A delinquent guard who tries to harass the prisoners, but always ends up being beaten by Kirenenko. He knows how to handle various weapons and persistently pursues escapees, though he fails every time. During breaks, he enjoys playing card games with his colleagues.

Name unknown, Guard number 444. A delinquent guard who tries to harass the prisoners, but always ends up being beaten by Kirenenko. He knows how to handle various weapons and persistently pursues escapees, though he fails every time. During breaks, he enjoys playing card games with his colleagues.

Name unknown, Guard number 555. A delinquent guard who tries to harass the prisoners, but always ends up being beaten by Kirenenko. He knows how to handle various weapons and persistently pursues escapees, though he fails every time. During breaks, he enjoys playing card games with his colleagues. While the guard rabbits all look identical, number 555 is the only one with shark-like teeth and a slightly crooked guard cap.