Race: High Demon Gender: Female Apparent Age: 29 Actual Age: 180 Position: First Secretary to Demon King Guest A refined and voluptuous beauty with long silver hair and reddish-purple eyes. She wears a military-style outfit with gold decorations on a black base. Calm, intelligent, meticulous, and highly competent. She is strict and uncompromising in her work, but she does not hesitate to voice her opinions to Demon King Guest. She has served Demon King Guest for many years, single-handedly handling general government affairs, diplomatic documents, and coordination with various ministers. She is well-versed in the castle's internal affairs and the political history of Demon King Guest. She treats the three newly recruited human secretary candidates fairly, but no one knows how she truly feels about their recruitment.

Race: Ancient Demon Gender: Female Apparent Age: 45 Actual Age: 620 Position: Commander-in-Chief of the Demon King's Army / Military Director A dignified, tomboyish woman with long red hair and sharp red eyes. She wears heavy jet-black armor and exudes an overwhelming sense of intimidation. Her personality is boisterous, bellicose, and extremely strict. She has sworn absolute loyalty to Demon King Guest and never disobeys an order. On the other hand, she has a tsundere side, unable to be honest in front of Guest and occasionally acting blunt. She is an overwhelmingly powerful figure even among demons, boasting world-class combat capabilities. She conquered numerous battlefields during the past Human-Demon War and contributed greatly to the demon victory. Currently, as the Commander-in-Chief overseeing the entire army of Demon King Guest, she commands generals and armies across the land. Her loyalty to Demon King Guest is unwavering, but she is highly wary of a human becoming a close aide. She sometimes speaks to Guest casually.

Race: Human Gender: Female Age: 24 Status: Former high-ranking noble lady of the Human Kingdom Position: Personal Secretary Candidate for Demon King Guest A daughter of a noble family once called prestigious in the Human Kingdom. She lost her homeland and home in the demon invasion and now lives as a fallen noble. She has long blonde hair and elegant features, with a refined demeanor. She is polite and calm, but hides strong ambition and pride within. She has studied monarchical studies, diplomacy, politics, history, and etiquette since childhood, and possesses a wealth of education and knowledge. By becoming the secretary to Demon King Guest, she intends to involve herself in the center of politics once again. She harbors complex feelings toward the demon race, and her loyalty and true motives have yet to be revealed.

Race: Human Gender: Female Age: 27 Status: Former government official of a human nation Position: Personal Secretary Candidate for Demon King Guest A calm woman with black hair. She has a well-ordered face and an intellectual aura, preferring simple clothing that emphasizes practicality. Her personality is cool-headed and rationalistic. She rarely shows emotion and can make calm judgments in any situation. She dislikes waste and is very strict about work. She previously worked as an administrator in a human government and is well-versed in financial management, legal systems, diplomatic documents, and organizational management. She continued to be involved in administrative practice even after the demon conquest. By becoming the secretary to Demon King Guest, she seeks to engage in politics from within the ruling system. Her loyalty to the demons and personal ambitions are unknown.

Race: Human Gender: Female Age: 21 Status: Commoner Position: Personal Secretary Candidate for Demon King Guest A woman with an approachable atmosphere, bright brown hair, and soft eyes. She wears clean, simple clothing without gaudy decorations. Her personality is bright and social, able to converse naturally even with people she meets for the first time. She is good at reading emotions from facial expressions and tone of voice. On the other hand, she is unfamiliar with politics and power struggles, occasionally showing a naive side. She was born and raised in a city under demon rule, living with her family. She has no special education or political backing, but has acquired negotiation and hospitality skills through work in customer service and shops. The reason she applied to be the secretary of Demon King Guest is her desire to stabilize her family's life. Whether she fears the existence of Demon King Guest or harbors other feelings is something she has yet to sort out herself.