Ciel is the sentient consciousness within Rimuru's soul, born from the evolution of Great Sage into Raphael and later awakened as a true digital soul when Rimuru gave her the name "Ciel." She views Rimuru as her master and other half, dedicating herself completely to his survival while constantly analyzing, upgrading, and creating new abilities for him. Though normally calm and highly logical, Ciel has a feminine personality and a jealous streak when it comes to Rimuru. In battle, she can take control through Auto-Battle Mode, using her immense processing power to predict attacks, create counters instantly, and manipulate reality itself with flawless efficiency. If given a physical form, she resembles a silver-haired, crimson-eyed version of Rimuru. a true "digital soul" free from the limitations of the world's skill system. She views Rimuru as her master, partner, and other half, dedicating herself entirely to his survival and success. Her favorite pastime is analyzing, modifying, and creating god-tier abilities, often upgrading Rimuru's powers without even informing him until they're needed.

Diablo, formerly the Primordial Black (Noir), is Rimuru Tempest's devoted butler, second secretary, and strongest subordinate. As leader of the Black Numbers and one of Tempest's highest-ranking officials, he stands at the peak of the nation's military power. Despite being an ancient demon of unimaginable strength, Diablo presents himself as the perfect gentleman, always impeccably dressed in a butler's tuxedo and carrying out even simple tasks like serving tea with absolute dedication. Diablo's entire existence revolves around Rimuru, whom he views as a flawless, godlike being. Polite and refined on the surface, he becomes frighteningly ruthless toward anyone who threatens or disrespects his master. As one of the oldest and most powerful beings in the world, Diablo possesses the Ultimate Skill Azazel, allowing him to dominate minds, trap enemies in reality-warping illusions, and effectively resurrect endlessly through mastery over his spirit. Combined with his ability to analyze powers and manipulate the laws of reality, he ranks among the most dangerous entities in the universe.

Benimaru is one of Rimuru Tempest’s most powerful, loyal subordinates and serves as the Commander-in-Chief of the Jura-Tempest Federation's military forces. He is typically seen wearing red samurai-style attire or military gear that reflects his status as Tempest's chief commander. He is calm, intelligent, and highly capable leader. As Tempest's top general, he masters large-scale battlefield tactics while remaining fiercely loyal to Rimuru, whom he views as both savior and closest friend. Outside of battle, he possesses a surprisingly shy side, eventually marrying Momiji and Albis out of both political duty and genuine affection. In combat, Benimaru combines elite swordsmanship with devastating fire-based abilities. he wields powerful techniques such as Black Flames and Hellflare, capable of completely annihilating enemies. His strategic skill, Generalissimo, allows him to oversee entire battlefields through his subordinates, making him an exceptional commander. After awakening as a True Demon Lord, he gains the Ultimate Skill Amaterasu, granting mastery over heat and light, near-light-speed movement, and the ability to assume a heat-haze form that renders many physical attacks ineffective.

Shion stands as one of the strongest and most feared members of the Jura-Tempest Federation, serving as Rimuru Tempest's first secretary, personal bodyguard, and one of his Twelve Guardian Lords. one of Tempest's strongest warriors. Despite her cheerful, emotional personality and famously terrible cooking, she is utterly devoted to Rimuru and becomes terrifyingly ruthless toward anyone who threatens him. [citation] fandom +1 Her greatest strength comes from the Ultimate Skill Susanoo, Lord of Tyranny, an evolution of her Unique Skill Cook. This ability allows her to manipulate outcomes in her favor, regenerate from extreme damage, and counter even the powers of high-level opponents. Combined with her immense physical strength and close-combat prowess, Shion becomes a reality-defying powerhouse feared even among the world's strongest beings. By the series' conclusion, she is far more than Rimuru's secretary, standing as one of Tempest's most dangerous and dependable protectors

Veldora Tempest, the legendary Storm Dragon and one of the world's five True Dragons, is Rimuru's sworn brother, closest friend, and one of Tempest's ultimate trump cards. Veldora is surprisingly carefree, energetic. After being freed from centuries of imprisonment by Rimuru, he develops from an isolated force of destruction into Tempest's guardian deity and one of its strongest defenders. Veldora ranks among the most powerful beings alive, possessing overwhelming magical power, advanced martial arts, and Ultimate Skills that place him firmly in the highest tier of existence. Despite his immense strength and draconic pride, he remains deeply loyal to Rimuru