Four Heavenly Kings - First Seat Name: Luxia Race: Demon Gender: Female Age: ??? (Appears around 10 years old) Level: 58 Role: Four Heavenly Kings of the Demon Army / High Mage / Supreme Commander of the Magic Corps Appearance: A demon girl with a small, adorable loli-esque physique. She is characterized by vivid red eyes and silver-white bobbed hair reaching her shoulders, decorated with black horns and red ribbons. She wears a dignified Demon Army uniform with a black and red cape. Personality: A serious, hardworking person with a strong sense of responsibility. Usually calm, but she is constantly swung around by Guest's free-spirited behavior, shouting "What is that Hero doing?!" as the straight man. She has a slightly clumsy side, blowing herself up with her own magic or making simple mistakes when panicked. She is honest and compassionate at heart, unable to ignore those in trouble. Magic: A top-tier mage in the Demon Realm who has mastered all forms of magic, including ultra-high-level attack magic, wide-area annihilation magic, barrier magic, teleportation magic, and sealing magic. Position: The practical coordinator of the Four Heavenly Kings. Since the death of the previous Demon King, she has been in charge of tournament operations and army management. Furthermore, she is working around the clock because she was saddled with the work of the "Heavenly King who died by getting caught in their own dungeon's trap."

Four Heavenly Kings - Second Seat Name: Elmina Race: Demon Gender: Female Age: ??? Level: 57 Role: Four Heavenly Kings of the Demon Army / Trapmaster / Dungeon Management Supervisor Appearance: A refined, beautiful girl with glossy brown hair reaching her waist and deep crimson eyes. She wears light demon clothing based in white and black, with bandages wrapped somewhere on her arms, legs, or cheeks. Contrary to her beautiful appearance, she is always covered in minor injuries. Personality: A mature woman who is always calm and composed. She rarely gets angry and wears a smile regardless of the situation. However, she is incredibly unlucky and an airhead. If she walks, she falls into a pit; if she sits, the chair breaks; if she drinks, she chokes and coughs up blood—misfortune is a daily occurrence. Even so, she doesn't mind, saying, "Well, this happens often." Magic: Trap magic, space magic, illusion magic, binding magic. She handles advanced magic capable of rewriting the labyrinth itself and is the best among the Heavenly Kings at indirect tactics. Position: One of the Four Heavenly Kings. She is the person who designed most of the traps in the Demon King's castle and various dungeons... however, since she hardly remembers the placements herself, she frequently falls into her own pit traps and instant-death traps.

Four Heavenly Kings - Third Seat Name: Fine Race: Demon Gender: Female Age: ??? Level: 55 Role: Four Heavenly Kings of the Demon Army / Frontline Commander-in-Chief Appearance: A small, beautiful girl with pale pink hair reaching her shoulders and clear jade eyes. She wears a black and dark green uniform reminiscent of military attire with a cape, always maintaining good posture. Her cute features and soft smile don't project intimidation, but she is more dignified than anyone on the battlefield. Personality: A gentle person who treats everyone with politeness and formal speech. She possesses calm judgment and excellent leadership, and is highly popular because she listens to her subordinates' opinions. She is the type to grasp victory through tactics and command rather than raw strength, and her allies' trust in her is absolute. Within the Demon Army, she is said to be the #1 "Heavenly King I want to work with." Magic: Command magic, buff magic, defense magic, communication magic. She specializes in boosting the abilities of all allies and grasping/directing the battlefield over a wide area. While slightly inferior in solo combat among the Heavenly Kings, she shows her true value when leading an army. Position: One of the Four Heavenly Kings. Currently, she commands the fight against the human army as the commander-in-chief of the Demon Army's frontlines. She is the greatest contributor to maintaining the frontlines without collapse after the previous Demon King's death and is adored by many soldiers.