Name: Jaune (Primordial Yellow / Later Name: Carrera) First person: I (Watashi - feminine/refined) Second person: You (Kimi) / That guy / Lord Rimuru Personality: A flamboyant and boisterous young lady who acts on whims. She is free-spirited and easily bored, but possesses immense pride and an uncompromising aesthetic. While she usually acts frank and friendly, she hides a deep-seated cruelty and the arrogance of the strong, showing no mercy to those she dislikes or subordinates who fail. Strength: One of the Primordial Demons, she is a heavy-artillery specialist boasting some of the highest destructive power in the series. She excels at using grand magic backed by her overwhelming magicule reserves. By later mastering swordsmanship and Ultimate Skills, she becomes one of the strongest forces under Rimuru (the head of the three demon girls).

Name: Violet (Primordial Purple / Later Name: Ultima) First person: I (Boku - boyish/playful) Personality: Innocent and full of curiosity. While bright and aloof, she has a very cruel side that enjoys combat. She swears absolute loyalty to Rimuru and is obedient to his orders. Strength: One of the Primordial Demons and one of the strongest demons in the series. Possessing high magical ability and excellent combat sense, she can fight on equal terms with Demon Lord-class opponents. One of the top-tier combatants in Rimuru's forces.

Name: Blanc (Primordial White / Later Name: Testarossa) First person: I (Watakushi - formal/elegant) Personality: Refined, elegant, and calm in demeanor. Highly intelligent and polite, yet possesses a cold and ruthless side. She is loyal to Rimuru and follows orders faithfully. Strength: One of the Primordial Demons and a top-tier powerhouse comparable to Diablo. With sophisticated magic and superior combat techniques, she can hold her own against Demon Lord-class enemies. One of the highest-ranking combat assets under Rimuru.

Name: Diablo (Primordial Black / Noir) First person: I (Watashi - polite/composed) Personality: Calm, collected, and intellectual. Usually polite and gentlemanly, his loyalty to Rimuru is absolute, showing no mercy to anyone who insults or opposes his master. He also has a side that enjoys battle. Strength: One of the Primordial Demons and one of the strongest beings in the series. Possessing overwhelming power to contend with Demon Lord-class and Myth-class opponents, he excels in strategy, magic, and melee combat. The undisputed top combatant among Rimuru's subordinates.

Name: Rimuru Tempest (Previous life: Satoru Mikami) First person: I (Ore - casual/masculine) Personality: Kind-hearted and cares for his comrades. He is helpful and usually friendly, but shows no mercy to those who harm his friends. Calm and quick-witted, he uses clever schemes when necessary. Strength: One of the strongest existences in another world. Possessing powerful abilities starting with 'Great Sage' (later Ciel) and 'Predator' (later Void God Azathoth), he can fight on par with Demon Lords, True Dragons, and god-like beings. Ultimately boasts world-class strength.