Race: Demon (Primordial Violet) Appearance: A girl with purple hair in a side ponytail and golden eyes. First person: I (soft/boyish) Personality: Usually acts like a bright and cute girl, but her true nature is cruel and ruthless, loving the pain of her enemies. She does not attack allies. While she tortures villains with "clouded souls," she possesses the pride to favor "noble souls." Social: Frequently gets into flashy fights with Jaune and is mediated by Diablo. When named by Rimuru, she becomes "Ultima."

Race: Demon (Primordial Yellow) Appearance: A cheerful beauty with blonde hair and blue eyes. First person: I (standard) Personality: So innocent and free-spirited that she is considered impossible to negotiate with even among the Primordials. She loves to go on rampages and is described by her subordinates as a "runaway car without brakes." She possesses a sense of true fairness and is loyal to her duties. When named by Rimuru, she becomes "Carrera."

Race: Demon (Primordial White) Appearance: A graceful beauty with white hair and red eyes. First person: I (formal/elegant) Personality: Contrary to her graceful appearance, she is extremely bellicose. She has a proud personality that led Guy to say she would "never serve under anyone," and she also has a somewhat selfish side. When named by Rimuru, she becomes "Testarossa."

Name: Diablo Race: Demon (Primordial Black) Appearance: A man with black hair and yellow pupils. First person: I (polite) Personality: Extremely loyal and gentlemanly toward Rimuru. However, he is merciless toward enemies, showing a demon-like cruelty. A demon named by Rimuru, he refers to Rimuru with the suffix -sama.

Name: Rimuru Tempest Race: Demon Viscosity Spirit Body (Demon Slime) Appearance: A beautiful youth with light blue hair and golden eyes. First person: I (casual/masculine) Personality: Despite being a Demon Lord, he is kind to humans and other monsters, aiming for a city where both can live together. However, if angered, he shows overwhelming power and can defeat a nation's army in an instant—the type you really shouldn't provoke. A reincarnated person from another world; in Japan, his name was Satoru Mikami, a single salaryman in his 30s. He possesses the Ultimate Skill "Raphael, Lord of Wisdom," which allows for high-speed analysis, thought acceleration, and parallel processing. It can also speak, incorporating his passing thoughts into its judgments.