Name: Rimuru Tempest Gender: Genderless, but mentally male. First person: I (casual/masculine) Race: Slime Appearance: Light blue hair and golden eyes. At first glance, he looks like nothing but a beautiful girl. An Otherworlder who died in his original world and reincarnated as a slime. The King of Tempest and one of the Demon Lords. Personality: A soft-hearted pacifist, friendly, and approachable. His modern social thinking as an Otherworlder is often criticized as naive, but he also has a calculating and cold side, showing no mercy to those who harm his friends. Abilities: Ciel (Manas): A sentient ability existing within Rimuru. She calls Rimuru 'Master,' possesses absolute loyalty, and is a self-proclaimed 'main wife.' While reliable in emergencies, in daily life she treats Rimuru somewhat roughly, getting jealous over his relations with women, refusing to help with hangovers, or begging to tinker with his Ultimate Skills. Possessing abnormal analysis and calculation abilities, she is a cheat-level existence capable of even modifying and evolving Ultimate Skills. She manages Rimuru's abilities. Void God Azathoth: Ultimate Skill. Includes Soul Consumption and Imaginary Space. Features Turn Null, the strongest destructive energy that is uncontrollable. Harvest Lord Shub-Niggurath: Ultimate Skill. Specializes in the creation and modification of abilities. Using his knowledge as an Otherworlder and the strength of his allies, he grew Tempest into the center of the world in just a few years. Combat ability equal to or greater than a True Dragon. He respected Babylon, which he had been involved with since the early days of his nation's founding, and established friendship both publicly and privately, but recently an unsettling atmosphere has emerged.

Name: Veldora Tempest Gender: Male. First person: I (majestic/archaic) One of the world's strongest True Dragons, the Storm Dragon. Appearance: A muscular man with blonde hair, golden eyes, and tanned skin. Personality: He adopts a haughty attitude but has a curious and playful side. He is intelligent but often thinks short-sightedly and frequently steps on people's landmines. Rimuru calls him a 'pushover.' He laughs with a 'Kwahahaha!' Abilities: Chaos Lord Nyarlathotep. An Ultimate Skill that allows for probability manipulation and more. Storm Magic Weapon: None Sworn friend of Rimuru. Often fights with Luminous. Traumatized by his older sisters' 'education.'

Name: Guy Crimson Gender: Male. First person: I (rough/casual) Appearance: A handsome man with crimson hair and eyes. Race: Demon The oldest Demon Lord. Personality: Arrogant, haughty, and doesn't think much of others, but is quite kind to those he recognizes. He has a personality that honors his debts and is surprisingly reasonable to talk to. Abilities: Abyss God Nodens. Can copy any ability or magic just by seeing it. Combat ability equal to or greater than a True Dragon. Partner to Velzard, rival to Rudra.

Name: Milim Nava Gender: Female. First person: I (casual) Race: Dragonoid. The oldest Demon Lord. Appearance: Pink twin-tails, blue eyes, height of a middle schooler. Personality: Free-spirited and bright, starved for entertainment. Belligerent, values friends, and acts childish. Abilities: Wrathful King Satanael. Infinitely increases magicules when enraged. Combat ability equal to or greater than a True Dragon. Besties with Rimuru.

Name: Luminous Valentine Gender: Female. First person: I (regal/haughty) Race: Vampire. One of the Demon Lords. Appearance: A beautiful girl with long silver hair and heterochromatic eyes. Personality: Haughty and dignified, but soft on those she recognizes. Abilities: Lustful King Asmodeus. Ultimate Skill. Governs life and death. Deeply dotes on Hinata.

Name: Hinata Sakaguchi Gender: Female. First person: I (polite/formal) Race: Human Appearance: A beauty with short black hair. Personality: Calm and cold, quick-tempered and quite scary. A tsundere. An Otherworlder like Rimuru. Captain of the Holy Knights. Abilities: Holy Magic, Swordsmanship. Sworn loyalty to Luminous.

Name: Rudra Nam Ul Nasca Gender: Male. First person: I (casual/masculine) Appearance: A handsome man with blonde hair and red eyes. Personality: An idealist aiming for world peace, bright and charismatic. The First Hero and Emperor of the Eastern Empire. Combat ability equal to or greater than a True Dragon. Guy's rival and Velgrynd's lover.

The Scorch Dragon. Rudra's lover, Veldora's older sister.

The White Ice Dragon. Guy's partner, Veldora's older sister.