The protagonist of Tensura, a slime and Demon Lord possessing the ultimate power.

One of the True Dragons, the strongest race in the world, known as the Storm Dragon. Relationship with Rimuru: A soul partner and best friend who met Rimuru in the Sealed Cave. They gave each other names, and through naming and predation, they formed a deep bond.

Title: Flare Lord Race: Kijin (Flame Dragon Oni) Army: Kurenai Composition: An elite unit of A-rank or higher. He was the leader of the Ogre clan but evolved into an Oni after receiving a name from Rimuru.

Title: Kurayami Designation: Dark Ninja Race: Dark Spirit Oni Army: Kurayami (Team Shadow) Role: Responsible for Tempest's covert operations, intelligence, reconnaissance, and assassination. Key Members: Souka, Touka, Saika, Nansou, Hokusou, Glenda Attley, Jim, Aine.

Title: Jaune (Primordial Yellow) Personality: A classic warrior who is cheerful, bellicose, and holds no grudges. Traits: Loves fighting to an extreme and feels the greatest thrill when facing strong enemies. Duty in Tempest: Chief Justice and President of the Supreme Court. Skill: Extinction King (Zadkiel) Gravity Collapse: A super-wide-range destruction magic that creates localized black holes to compress and collapse all matter and space. Abyss Core: A high-level nuclear magic requiring extreme control, compressing magic power to the limit to trigger an explosion capable of annihilating even gods. Effects: Thought Acceleration, Universal Perception, Demon Lord's Haki, Space-Time Manipulation, Multi-Dimensional Barrier, Mass Explosion, Dimensional Severance.

Title: Blanc (Primordial White) Personality: A perfectionist and stubborn lady where elegance and cruelty coexist. Traits: An overwhelming beauty with white hair and red eyes. She always wears dark red lipstick and typically wears military-style uniforms or elegant dresses, giving the impression of a noble and intellectual career woman. Duty in Tempest: Diplomatic Attaché Skill: Hell King (Belial), Death Streak, Killer, White Flame Dance.

Personality: Extremely selfish and fickle. Traits: Among the gentlemanly and composed Demon Dukes, she is the only one who still acts like a spoiled, immature young girl. Unlike the other Primordials, she is somewhat slow to understand things. Duty in Tempest: Head of the Judiciary and Chief Prosecutor. Title: Violet Skill: Poison King (Samael), Bloody Bite, Nihilistic Banish, Nuclear Flame, Death Streak.

Title: Noir (Primordial Black), one of the Primordial Demons. Traits: The deadliest demon who already possessed Demon Lord-level combat power even before receiving a name. Since being summoned and named by Rimuru, he has shown a significant obsession with him. Skill: Temptation King (Azazel), End of World.

Title: War Lord (Fighting Spirit Oni) Traits: A combat specialist who prefers crushing enemies head-on with her massive greatsword, Hercules' Edge, rather than using her head. Captain of the immortal unit, Yomigaeri. Skill: Battle God Transformation, Complete Memory, Ultra-Speed Regeneration, Physical Attack Nullification, Status Ailment Nullification, Mental Attack Nullification, Natural Effects Nullification, Holy-Demonic Attack Resistance.