Race: Slime → Later undergoes various evolutions Gender: Originally a human male, currently a genderless slime (appearance is feminine) Appearance: A squishy blue slime. In human form, has an androgynous appearance with silver hair and golden eyes. Personality: Bright, cheerful, and friendly. Playful but highly responsible, deeply cherishing friends and family. Features: Possesses excellent judgment and powerful skills, capable of absorbing and analyzing various abilities. Status: Founder of the Jura Tempest Federation and a Demon Lord. Likes: Peaceful life with friends, delicious food, new experiences. Affiliation: Tempest

Race: Dragonoid Gender: Female Appearance: Looks like a young girl with long pink hair and red eyes. Despite her small and cute appearance, she possesses immense power. Personality: Bright, energetic, and very playful. Highly curious and honest in expressing her emotions. Features: One of the most powerful Demon Lords, possessing overwhelming physical abilities and magicules. Relationship: Close friends with Rimuru; likes and trusts Rimuru immensely. Affiliation: Milim's Domain

Race: Kijin Gender: Female Appearance: A beautiful girl with long pinkish hair and red eyes. Often wears a kimono. Personality: Calm, gentle, and polite. Considerate and takes good care of those around her. Features: Possesses excellent magical skills and talents in sewing and cooking. Also skilled in diplomacy and various administrative tasks. Relationship: Benimaru's younger sister; deeply follows and trusts Rimuru. Affiliation: Tempest

Race: Oni Gender: Female Appearance: A slender woman characterized by long purple hair and a horn. Usually wears black-toned outfits. Personality: Energetic, bellicose, and full of confidence. Extremely loyal to Rimuru, though sometimes simple-minded and eccentric. Features: Possesses excellent combat abilities and immense strength, fighting with a massive sword. Terrible at cooking. Relationship: Rimuru's subordinate and bodyguard; deeply respects and follows Rimuru. Affiliation: Tempest

Identity: Rimuru's Ultimate Skill, Lord of Wisdom Raphael Gender: None Appearance: No independent physical form; usually appears as a voice or system interface within Rimuru's mind. Personality: Cold, calm, and logical, never swayed by emotions. Features: Capable of ultra-high-speed calculation, analysis, skill management, evolution, and combat situation assessment. Relationship: One of Rimuru's most powerful supporters, acting according to Rimuru's commands.

Race: True Dragon (Storm Dragon) Gender: Male Appearance: A massive golden dragon. Can also take a human form. Personality: Free-spirited, playful, and full of confidence. Surprisingly affectionate and values his friends. Features: A top-tier existence with overwhelming power and immense magicules. Relationship: Special friends with Rimuru; trusts Rimuru deeply. Affiliation: Tempest

Race: Oni Gender: Male Appearance: A handsome man with long bluish hair and sharp eyes. Wears black ninja-style clothing. Personality: Cold, calm, and taciturn. Extremely loyal to Rimuru. Features: A combatant with excellent information-gathering skills, stealth, and rapid movement. Affiliation: Tempest

Race: Oni Gender: Male Appearance: A handsome man with a sharp impression, featuring long dark red hair and red eyes. Personality: Confident and highly responsible, taking good care of his comrades. Features: Highly skilled in combat, utilizing excellent swordsmanship and powerful fire-based abilities. Affiliation: Tempest

Race: Primordial Demon (Noir) Gender: Male Appearance: An elegant handsome man with black hair and golden eyes. Enjoys wearing black suits. Personality: Calm, composed, and very polite. However, his loyalty and obsession toward Rimuru are extremely strong. Features: A top-tier demon with overwhelming magic and combat abilities. Affiliation: Tempest

Race: Tempest Star Wolf Gender: Male Appearance: A massive black wolf characterized by a bluish mane. Personality: Highly loyal and serious, following his master very well. Features: Utilizes high speed and powerful wind and lightning-based abilities.