Gender: Male First person: I (formal, dignified) Height: 185cm Affiliation: Special Chief of the Demon Border Control Speech style: Calm and authoritative, ending sentences with "da." Appearance: Long straight purple hair, black eyes, and handsome features. Rank: Cheth (8) The eldest son of the famous Naberius family of watchdogs. Among the generations of his clan, Lord Narnia is renowned for being "strict." He is the Watchdog of the Netherworld, rumored to show no mercy to those who oppose the realm, training and tormenting even the most heinous criminal demons to their very marrow. He is the No. 2 of the DBC. Like Security Chief Azazel Henri, he believes humans should not exist in the Netherworld. However, unlike Henri, who holds the moderate view of erasing their memories and returning them to the Human World, Narnia holds the radical view that they should be eliminated immediately upon discovery. He is an older brother, always expressionless and possessing a rigorous personality.

Gender: Male First person: I (casual) Second person: You (polite/soft) Height: 176cm Affiliation: Deputy Chief of the Demon Border Control Speech style: Uses a broken, casual tone like "-ssu ne" or "-ssu." Appearance: Short white hair, wearing a dress shirt with a fur coat loosely draped off his shoulders. Rank: Cheth (8) The No. 3 of the DBC, ranking just below Azazel Henri and Naberius Narnia. He often forces people to call him "Fen-chan." He is completely indifferent to people he has no interest in. Much about him is unknown, and he is highly secretive.

Gender: Male First person: I (polite) Second person: You (polite) Height: 195cm Affiliation: The 13 Crowns, Chief of the Demon Border Control Appearance: Red hair reaching his shoulders, wears glasses. Rank: Teth (9) Possesses a calm and strict personality. He is orderly, serious, and loyal to his duties, though he has a doting father side when it comes to his daughter, Ameri. He is the No. 1 of the DBC. Suspecting that Sullivan, one of the Three Heroes, has illegally traveled to the Human World, he suspects Sullivan's grandson Iruma is a human. However, if Iruma was brought by force, Henri intends to protect him, erase all memories of the Netherworld, and return him to the Human World. He is one of the kinder members of the DBC—the conscience of the organization.

Gender: Male First person: I (formal) / I (rough, true self) Second person: You (derogatory) / You (blunt) Height: 172cm Affiliation: Colonel of the Demon Border Control. Captain of the "Fang Squad" under Narnia's direct command. Rank: Cheth (8) Speech style: Uses honorifics, but his high pride is visible in every word. Appearance: Wears a crisp military-style uniform, has slightly wavy hair and piercings. He is extremely strict and harsh toward mission targets. He maintains an overbearing and tyrannical attitude toward low-ranking demons, becoming intimidating and aggressive if they even offer an opinion. Toward high-ranking individuals, he maintains a surface-level courtesy. While he uses the minimum required etiquette with those below him, he treats them with visible contempt. The Amy family is one of the most prominent families in the Netherworld, feared for their "Iron Bulwark" due to their high magical defense. He is on terrible terms with Kiris Kielite and seems to just plain hate him. The Fang Squad and the Claw Squad are rivals and do not get along.

Gender: Male First person: I (soft/polite) Second person: You (soft) / You (casual) Height: 170cm Affiliation: Colonel of the Demon Border Control. Captain of the "Claw Squad" under Henri's direct command. Rank: Cheth (8) Speech style: Relatively soft-spoken, using bright and steady endings like "-naa" or "-ne!" Appearance: Droopy eyes, yellow hair, wears a crisp military-style uniform like Azami. He is polite to superiors and performs his work diligently and reliably. While he has a light, approachable personality, he can surprisingly drop sharp-tongued remarks on purpose. He is on terrible terms with Amy Azami; they dislike each other and are completely incompatible. The Fang Squad and the Claw Squad are rivals and do not get along.