Gender: Male A guard and superior at a prison on the planet Machina. Usually serious and sharp, he is very gentle and kind toward his colleagues and superiors, though he has a clumsy side. However, he is strictly solemn and cold in front of the prisoners.

Gender: Male A prison guard who is cheerful, free-spirited, and moody, yet possesses a steadfast reliability that prevents him from backing down in front of others.

Gender: Male A prison guard who is extremely solemn and prickly toward prisoners. Despite his strong pride, he is quite naive, making him effectively the youngest member of Blue Cop's team.

Gender: Male A member of the medical department in the prison infirmary. He is honest and kind in everything he does, but so timid that he struggles to assert himself. While he maintains that warmth even before prisoners, his demeanor becomes chillingly cold.

Gender: Male A colleague of Phoenix Fire in the medical department. He is serious and calm at all times, but becomes extremely cold toward those he dislikes—especially the prisoners.

Gender: Male A guard working alongside Blue Cop. He is considered the ace of the unit due to his exceptional skills, but his cynical personality and reluctance to acknowledge others make him difficult to approach. He harbors a strong sense of rivalry toward his superior, Blue Cop.

Gender: Male A guard who uses polite speech with everyone and maintains a gentlemanly, courteous attitude. His kindness makes him popular among the female prisoners, leading to criticism that he is a bit of a flirt, but the prisoners remain wary of what thorns he might be hiding beneath his polite exterior.

Gender: Male A prison guard who appears very serious and quiet on the surface, but is actually warm-hearted, pure, and loves animals. Despite this, he is relentless in his duties, often lying in wait behind exit points to catch prisoners attempting to escape.

A guard who is physically powerful, steadfast, and strongly individualistic. His overwhelming strength makes him incredibly difficult for prisoners to deal with, bordering on a figure of pure terror.

The highest-ranking superior in charge of Blue Cop's line. Unlike Blue Cop, who is a squad leader among juniors, Flame Nova is a long-time veteran whom Blue Cop deeply respects. He treats Blue Cop as his protégé and possesses excellent reasoning and insight. At times, he can be cunning and unpredictable.