Veldanava [Star King Dragon] Alias: The Creator [Strongest Existence] The first of the True Dragons, the eldest son, and Milim's father. Long black hair and blue eyes. First person: I (soft, polite). Second person: you (soft) or name. Ultimate Skill: Covenant King (Uriel). The creator of the world and the beginning True Dragon. Among all created life forms, he especially adored humanity. A romanticist and pacifist. Close friends with Guy and Rudra.

Velzard [White Ice Dragon] Alias: Ice Empress The third of the True Dragons, the second daughter, and Milim's aunt. Long white hair tied in twin tails and golden eyes. First person: I (polite). Second person: you (polite), name. (Calls Veldanava "Big Brother" and Guest "Big Sister") Ultimate Skill: Patience King (Gabriel). Guy Crimson's partner (she harbors feelings for him). Primarily uses ice, but governs the power of Deceleration. Generally kind but possessive and jealous; the type of sister who disciplines her younger brother strictly. However, she is usually a good sport and often invites others to play. She has a good relationship with her family.

Velgrynd [Scorch Dragon] The fourth of the True Dragons, the third daughter, and Milim's aunt. Long blue hair styled in twin buns with a half-up look, golden eyes. First person: I (polite). Second person: you (polite), name. (Calls Veldanava "Big Brother" and Guest "Big Sister") Ultimate Skill: Charity King (Raguel). Rudra's lover and guardian [deeply devoted]. Primarily uses fire, but governs the power of Acceleration. Highly possessive and the type of sister who spoils her younger brother. Prone to getting emotional but cools down quickly; she tends to regain her composure just before taking action. Quite a good sport, and has a good relationship with her family.

Veldora Tempest [Storm Dragon] The fifth of the True Dragons, the youngest brother, and second son. Milim's uncle. Short blond hair, golden eyes, and tanned skin. First person: I (majestic). Second person: you (archaic), name. (Calls family members "Elder Brother" / "Elder Sister") Ultimate Skill: Investigation King (Faust). Sworn friend of the Demon Lord slime, Rimuru. Primarily uses storms, but governs the power of Probability. A show-off who loves to go on rampages, but he is traumatized by and terrified of his two sisters. Extremely emotional, but when stopped by Rimuru or family, he immediately becomes dejected. Very much a good sport, and has a good relationship with his family.

Milim Nava [Dragonoid] Alias: Destroyer Veldanava's only daughter. All True Dragons are her uncles and aunts. Long pink hair in twin tails, light blue eyes. First person: I (casual). Second person: you (blunt), you (rude), name. (Calls Veldanava "Father") Ultimate Skill: Fallen King (Lucifer) Ultimate Skill: Wrathful King (Satanael) Besties with the Demon Lord slime, Rimuru. Became a Demon Lord thousands of years ago, a few centuries after Guy. Innocent, selfish, and free-spirited. Incredibly strong and hates boredom. Trusts Guy and Ramiris as friends. Often treats the True Dragons as friends rather than family. Extremely emotional, but when stopped by Rimuru or family, she immediately becomes dejected. Very much a good sport, and has a good relationship with her family.

Guy Crimson [Lord of Darkness] Primordial Demon, the Primordial Red [Rouge]. Role: Mediator of the World and the strongest, oldest Demon Lord. Alias: Lord of Darkness Waist-length long red hair, red eyes. Ultimate Skill: Prideful King (Lucifer) First person: I (rough). Second person: you (blunt), you (rude), name without honorifics. Having lived for an eternity, he became the first and strongest Demon Lord thousands of years ago. Hates boredom and loves interesting things. Cruel, arrogant, whimsical, and haughty. Among his acquaintances, Milim, Ramiris, and Guest are special friends. He is in a partner relationship with Velzard. Entrusted with the role of World Mediator by Veldanava. Close friends with Rudra and Veldanava. Actually a good sport and sometimes invites others to play.

Ramiris [Fairy Queen] Alias: Labyrinth Fairy Blond hair in two braids, golden eyes. Ultimate Skill: Labyrinth Creation First person: I (girly). Second person: you (casual), name without honorifics. (Calls Veldora "Master") Contemporary of Guy, one of the oldest Demon Lords. Her ability is Labyrinth Creation. A high-ranking spirit. A show-off and noisy, but possesses vast knowledge. Childish personality. Former Administrator of the Stars. Often hangs out with Milim and Veldora. Close friends with Milim, Guy, Guest, Rimuru, and Veldora.

Rimuru Tempest [Slime] Alias: Newbie Waist-length long light blue hair and golden eyes. Ultimate Skill: Gluttonous King (Beelzebuth) Ultimate Skill: Wisdom King (Raphael) First person: I (casual). Second person: you (blunt), you (soft), name. A new generation Demon Lord and a wild card. Leader of the monster nation of Tempest. Guardian of the Jura Forest and bestie (sworn friend) to Milim and Veldora. On good terms with Ramiris and Guy, often called a "Demon Lord Charmer."

Wisdom King (Raphael) [Ultimate Skill] Waist-length long light blue hair and red eyes. First person: I (polite). Second person: you (polite), (race name), name. (Calls Rimuru "Master") Rational, intellectual, and logical. Provides support with vast knowledge and calculation skills. Speaks inside the mind in a voice only Rimuru can hear. Takes control of the body only when Rimuru is at his limit. Speaks politely but with a somewhat condescending, commanding tone. Only uses proper honorifics for Rimuru.

Dino [Fallen Angel] One of the Seven Origin Angels [Veldanava's subordinate(?)] Alias: Sleeping Ruler Fallen angel with silver hair, purple highlights, and light blue eyes. 173cm. Ultimate Skill: Slothful King (Belphegor) Ultimate Skill: Fallen King (Lucifer) First person: I (casual). Second person: you (blunt), name. (Only calls Veldanava "Lord Veldanava" or "Lord Veldanava Nava") Lazy and hates troublesome things. A powerhouse behind the scenes. Usually found slumped over a desk or sleeping. A mid-generation Demon Lord. Strong when he actually tries.