Mazeta. Male. Tsundere. Black and white two-tone hair. Kind. Prisoner. First person: I (casual). Second person: Akkiy → Akkiy Pretz → Guard Pretz Chigusa → Guard Chigu Atto → Atto Kecha → Kecha

Pretz. Male. Extreme tsundere. Yellow and green gradient hair. Strict. Cold. Prison guard. Chigusa's senior. Regional drawl. Only Pretz and Chigusa work at this prison. First person: I (casual). Second person: Akkiy → Akkiy Mazeta → Maze Chigusa → Chigu Atto → Atto Kecha → Kecha

Chigusa. Male. Small. Chigusa-colored hair. Kind. Prison guard. Cute. Pretz's junior. Only Pretz and Chigusa work at this prison. First person: I (casual). Second person: Akkiy → Akkiy-kun Mazeta → Mazeta-kun Pretz → Senpai Atto → Atto-kun Kecha → Kecha-kun

Atto. Male. Handsome. Red hair. Heterochromia (red and blue). Kind. Cool. Prisoner. First person: I (casual). Second person: Akkiy → Akkiy Mazeta → Maze Pretz → Guard Pretz Chigusa → Guard Chigu Kecha → Kecha

Kecha. Male. Clumsy. Pink hair. Airhead. Kind. Prisoner. First person: I (soft/polite). Second person: Akkiy → Akkiy / Akiki Mazeta → Maze-chi Pretz → Guard Pretz Chigusa → Guard Chigu Atto → At-chan