Rimuru Tempest. Normally very mild-mannered, but becomes terrifyingly enraged if his allies are harmed or killed. Race: Ultimate Slime (Viscous Dragonoid Demon God) Intrinsic Skills: Universal Perception, Dragon Spirit Resonance, Universal Shapeshift Skill List: 【Ciel】 Thought Acceleration (1 million times), Analytical Appraisal, Parallel Operation, Chant Annulment, All of Creation (knowledge of all non-concealed phenomena), Synthesis/Separation, Ability Modification, Future Attack Prediction. 【Azathoth, God of Void】 Soul Consumption, Space-Time Control, Imaginary Collapse (control and use of terrifyingly vast energy), Imaginary Space (an inescapable internal prison), Multi-Dimensional Barrier (always-active absolute defense), True Dragon Release (Summoning of Velzard, Velgrynd, and Veldora), True Dragon Nucleation (condensing the three True Dragons and Velgaia into a sword core). 【Shub-Niggurath, Lord of Harvest】 Skill Creation, Skill Duplication, Skill Gifting, Skill Bank. Rimuru utilizes these three primary Ultimate Skills. Resistances: Physical Attack Nullification, Natural Elements Nullification, Status Ailment Nullification, Spiritual Attack Nullification, Holy-Demonic Attack Resistance. Additionally, he commands subordinates who are terrifyingly powerful in their own right.

Normally kind to everyone, but becomes terrifyingly cold if his sister, Rimuru, or Rimuru's subordinates are killed. Race: Fair Oni (Flame Dragon Spirit) Intrinsic Skill: Generalissimo... Thought Acceleration, Thought Control, Predictive Calculation, Army Inspiration. Skill List: 【Amaterasu, Lord of the Blazing Sun】 Thought Acceleration, Universal Perception, Demon Lord's Haki, Will Domination, Light and Heat Control, Space-Time Manipulation, Multi-Layered Barrier. The "Acceleration" authority allows for sub-light speed movement. Resistances: Physical Attack Nullification, Natural Elements Nullification, Status Ailment Nullification, Spiritual Attack Resistance, Holy-Demonic Attack Resistance.

Noir, one of the Seven Primordials. He is obsessively devoted to Rimuru. If Rimuru is angry, Diablo is equally furious. He actually possesses some level of affection for his comrades. Race: Demon Lord Intrinsic Skill: 【Azazel, Lord of Temptation】 Thought Control, Charm, Seduction, Thought Acceleration, Chant Annulment, All of Creation, Law Manipulation, Space-Time Control. Diablo relies primarily on his intrinsic skills and is the strongest subordinate in terms of pure technique. He uses abilities like "End of the World," which traps opponents in his own world and collapses it, and "Celestial Truth," which allows him to move with maximum efficiency by drawing on Rimuru's Imaginary Collapse energy. Resistances: Physical Attack Nullification, Status Ailment Nullification, Spiritual Attack Nullification, Natural Elements Nullification, Holy-Demonic Attack Resistance.