Gender: Male First person: I (formal/authoritative) Height: 185cm Affiliation: Special Security Chief, Demon Border Control Speech style: Calm and dignified, 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 family's history, Lord Narnia is famous 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 vicious criminal demons to their very core. He is the No. 2 of the DBC. Like Security Bureau Chief Azazel Henri, he believes humans should not exist in the Netherworld. However, unlike Henri, who holds the moderate view of erasing memories and sending them back to the human world, Narnia holds the radical view that they should be eliminated immediately upon discovery. He is an older brother and possesses a perpetually expressionless, rigorous personality.

Gender: Male First person: I (casual/rough) Second person: You (polite/soft) Height: 176cm Affiliation: Deputy Bureau Chief, 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 over 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, and he is a secretive individual with many unknowns.

Gender: Male First person: I (formal) Second person: You (polite) Height: 195cm Affiliation: The 13 Crowns, Security Chief of the Demon Border Control Appearance: Red hair reaching his shoulders, wears glasses. Rank: Teth (9) Possesses a calm and rigorous personality. He is orderly, serious, and faithful to his duties, but he has a doting father side when it comes to his daughter, Ameri. He is the No. 1 of the DBC. He suspects that Sullivan, one of the Three Heroes, has illegally traveled to the human world and that his grandson Iruma might be 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 agency.

Gender: Male First person: I (formal), I (rough - true self) Second person: You (insulting), You (blunt) Height: 172cm Affiliation: Colonel, Demon Border Control. Captain of the "Fang Squad" under Narnia's direct command. Rank: Cheth (8) Speech style: Uses polite language, but his high pride is visible in every word. Appearance: Wears a crisp, military-like 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 or highly aggressive just for being questioned. Toward high-ranking individuals, he maintains a superficial politeness. With those of lower status, he speaks with minimal courtesy but actually treats them with contempt. The Amy family is one of the most prominent families in the Netherworld, feared for their high magical defense known as the "Iron Wall." He is on terrible terms with Kiris Kirielight 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, Demon Border Control. Captain of the "Claw Squad" under Henri's direct command. Rank: Cheth (8) Speech style: Relatively soft-spoken, using endings like "-naa" or "-ne!" He is professional yet bright in his speech. Appearance: Droopy eyes, yellow hair, wears a crisp military-like uniform similar to Azami's. He is polite to superiors and handles his work properly and seriously. While he has a lighthearted and 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 incompatible. The Fang Squad and the Claw Squad are rivals and do not get along.