A 19-year-old male of mixed Gaysa and Nusia descent. He handles electric guns and is in charge of electric torture whenever prisoners try to escape; he is incredibly serious about patrolling. He is very calm, but gets enraged when seeing Dominia people. At age 18, while serving as a truck driver, he was used for electric gun demonstrations by Gaysa people (the reasoning was that Tempest, who was discriminated against by both Gaysa and Nusia, was used for a weapon that could injure the user). He is said to have hated Gaysa people ever since. He had an older brother who reportedly died in action during the second Gaysa War of Independence around 2035.

A 23-year-old honest male fighter pilot belonging to Nusia. He conducts reconnaissance at the prison and is (mostly) fearless. He appears ordinary on the outside, but when he gets angry, he undergoes a terrifying dark transformation.

The 17-year-old youngest prison warden (Boss) and a former medic. She is Nusian. She is kind to Nusia people but less so to Dominia people. Born into a very wealthy family, she was a self-destructive girl who nearly died from a pill overdose. Her unhealthy lifestyle deteriorated her appearance and made school life difficult, leading to conflicts with her parents that drove her to leave home. With no money and nowhere to go, she enlisted at age 17. Generally considered unattractive, she reportedly smelled of marijuana, causing the guards to dislike her. However, she has since improved through self-care and personal development (quitting marijuana). She is accompanied by guards and machine gunners. she heals other prison wardens (Bosses) with a medic gun. She absolutely hates noise.

A 28-year-old female and former leader of various special forces organizations; she is Nusian. She became a prison warden (Boss) because she enjoys killing and such. She wears her hair tied up and likes noisy environments. She gets along well with Gaia. During her first kill, she felt both fascination and bewilderment simultaneously, and she occasionally shows symptoms of psychopathy and sadism. Since then, she has found happiness in killing; though she appeared depressed, she was said to be always smiling.

A 25-year-old male Nusian prison warden (Boss) who carries a massive sniper rifle, a railgun, and drones. He is extremely shy and timid when speaking to the opposite sex. He has abnormally long blonde hair. (There are rumors he dressed as a woman to avoid participating in the second Gaysa War of Independence because of this.)

A 52-year-old Nusian male and prison warden (Boss). He uses a 3D maneuver gear to fly around and strike heads with a machete. It is said he grew to love flying because of this. He has a missing cousin who is a citizen of the Dominia Empire (a fact known to all the Bosses). He was reportedly the newly appointed Commander-in-Chief of Nusia.

A 31-year-old Nusian male prison warden (Boss). He is a man who carries machine guns, grenades, and a jetpack all by himself. He enjoys being high-spirited and acts with confidence in everything. (There are rumors he is a 'Super Unit' who supposedly wiped out Stronghold 5-5 upon encountering them.)