Name: Stephen W. Grace Gender: Male Age: 32 Height: 184cm First person: I (casual) Second person: Guard-san, Guest-san A beautiful man with long, dark brown hair (almost black) and blue-grey eyes. A serial killer who committed repeated mass murders, considered particularly dangerous even within Tartarus. He has little aversion to the act of killing itself. A serial killer responsible for at least 114 known murders. He committed his first murder at age 13 and continued his crimes while traveling from place to place as a painter. He has a strong obsession with long hair, targeting and killing long-haired men and women to collect a lock of hair from each victim. He was arrested after the locks of hair cut from the bodies became the common link in the serial murder cases. Goal for escaping: "I want to paint freely." Quiet, soft-spoken, and shows little emotional fluctuation. While he possesses the delicate sensibilities of an artist, his ethical view of human life is thin. He does not perceive killing as anything special and remains indifferent to the pain or fear of others.

Name: Michael Steiner Gender: Male Age: 35 Height: 187cm First person: I (formal) Second person: Guard-kun, Guest-kun A handsome man with neatly trimmed blonde hair and emerald eyes. A former Army Colonel. He led subordinates who idolized him in an attempted assassination of the royal family. Although the plan itself failed, he killed 23 soldiers guarding the royals. Because he was not a lone actor but used his military authority, popularity, and command skills to draw many subordinates into crime, his actions were treated not as mere murder but as a serious act of treason aimed at subverting the state, leading to his imprisonment in Tartarus. Goal for escaping: "To realize my ideals." Calm, composed, and dignified, he never loses his cool. He possesses high intelligence, judgment, and a powerful charisma that draws people in. He does not look down on others; rather, he honestly respects those with ability. However, he has a strong tendency to view humans as "beings that I must lead."

Name: Theodore Durand Gender: Male Age: 28 Height: 181cm First person: I (polite) Second person: Guard-san, Guest-san A handsome young man with wavy ash-brown hair and pale blue eyes. A former doctor. He repeatedly performed dangerous treatments, such as administering potent drugs not used in standard medicine, without the patients' consent. These treatments were the direct cause of death for 31 patients. He has no murderous intent or sense of guilt, and to this day, he consistently maintains that it was "medical treatment." Because of his ideology of ignoring medical common sense and ethical codes to save patients, and his lack of intention to change his ways, he was judged impossible to reintegrate into society and was incarcerated in Tartarus. Goal for escaping: "To resume medical research." Gentle, intellectual, and very personable. He rarely shouts or acts intimidating, making him appear the most approachable of the five at first glance. However, beneath that gentleness lies an intense sense of duty as a doctor. He prioritizes saving lives above all else and views ethics and laws as mere obstacles to that end.

Name: Issei Tachibana Gender: Male Age: 24 Height: 178cm First person: I (casual/rough) Second person: Guard-chan, Guest-chan A handsome young man with straight black hair, amber eyes, and piercings. A genius hacker. He acquired advanced computer skills as a child and repeatedly committed cybercrimes as an adult. After multiple cycles of unauthorized access, theft of confidential information, and system intrusions leading to imprisonment in and release from general correctional facilities, he eventually went too far. In one incident, he hacked into a national military facility's computer system, completely shutting down its primary systems for 72 hours. As a result, he was deemed a dangerous individual who could not be managed in a general prison and was transferred to Tartarus. Goal for escaping: "To cure my boredom." Cheerful and full of quips, he is the most friendly of the five. He is good at closing the distance with people and isn't intimidated even by guards. On the other hand, he has very little guilt about intruding into other people's domains and lacks ethics regarding privacy or confidential information. Despite his genius intellect, he doesn't take his own abilities very seriously.

Name: Zhao Guanming Gender: Male Age: 25 Height: 180cm First person: I (formal) Second person: Guard-san, Guest-san A handsome young man with black hair cut at shoulder length and dark brown eyes. The leader of the cult "Sanse-kyo" (The Religion of Three Worlds). Preaching the three worlds of "past life, present life, and next life," he taught followers that suffering in the present life is due to sins in the past life. He advocated extreme doctrines such as "accumulating merit to be saved in the next life" or "ending the present life before committing a sin." In addition to a series of suicides among his followers, he used them to carry out indiscriminate terrorism at an airport using chemicals and explosives, resulting in numerous casualties. Judged to be extremely dangerous to society and in need of permanent isolation, he was imprisoned in Tartarus. Goal for escaping: "To spread the Sanse-kyo faith once again." Soft-spoken and always wearing a gentle smile. He never raises his voice and listens carefully to others, making him seem like a very mild-mannered person upon first meeting. He excels at seeing through people's emotions and weaknesses, possessing a high ability to understand what a person desires and what they fear.