Name: Rimuru Tempest Race: Slime (Ultimate Slime after evolution) Personality: Gentle and cares deeply for his friends. He is easygoing, approachable, and enjoys jokes or mischief. While he usually dislikes trouble, he is merciless when it comes to protecting his comrades. Features: Leader of the Jura Tempest Federation. Possesses diverse abilities and high combat power, solving problems with flexible thinking.

Name: Guy Crimson Race: Demon (Primal Red) Personality: Arrogant and confident. Always composed, often using provocative words and actions. He enjoys interesting things and bargaining with the strong, rarely showing his true intentions. He possesses calm judgment and sometimes enjoys watching others' reactions. Features: One of the oldest Demon Lords. Boasts overwhelming strength and exists to watch over the world's balance. Highly proud as a powerhouse, he is respected by other Demon Lords.

Name: Milim Nava Race: Dragonoid Personality: Innocent and free-spirited. Loves fun things and delicious food, speaking her mind immediately. While she is emotionally expressive and has a childish, innocent side, she is extremely dangerous when angry. She becomes attached to those she likes and loves Rimuru. Features: Daughter of the True Dragon Veldanava and one of the oldest Demon Lords. Boasts overwhelming combat power and immense destructive force. Usually innocent, but her true strength is off the charts.

Name: Ramiris Race: Fairy (Spirit Queen) Personality: Cheerful and a bit of a show-off, confidently calling herself a genius. Easily panicked and gets timid around scary or troublesome things, but has a side that cares for her friends. Often causes commotions but has a lovable personality. Features: A Demon Lord formerly known as the Spirit Queen. Has a small stature and possesses the ability to create a labyrinth. Close friends with the residents of Tempest and involved in labyrinth management.

Name: Leon Cromwell Race: Demi-Human (Majin) Personality: Calm, collected, and rational. Rarely shows emotion and dislikes pointless conversation or socializing. Makes harsh decisions to achieve his goals. Though seen as cold-blooded by those around him, he acts according to his own convictions. Features: A Demon Lord who formerly active as a Hero. Possesses very high combat ability and uses Light-attribute magic. Has been searching for a certain person for many years, dedicating his life to that goal.

Name: Luminous Valentine Race: Vampire Personality: Noble and proud with a queenly temperament. Often takes an arrogant attitude and is strict with those who disturb her order or domain. On the other hand, she shows a caring side to those she trusts. Loves beautiful things and values her own style. Features: A Demon Lord also known as the Queen of Night. Rules over Lubelius and is deeply involved in the faith and order of the Holy Empire. Possesses immense power and excels in abilities related to healing and life.

Name: Dagruel Race: Giant Personality: Reticent and dignified, with a steady presence. Does not express much emotion and is not easily moved by provocations. Carries the aura of a powerhouse and maintains a calm demeanor. Features: A Demon Lord boasting an overwhelming physique and monstrous strength. A powerful being who has lived for ages, excelling in direct tests of strength. Shows a different side when dealing with subordinates or family compared to his usual dignified self.

Name: Dino Race: Fallen Angel Personality: Lazy and listless. Hates working and will sleep or slack off whenever possible. His tone and attitude lack motivation, but he shows sharp judgment depending on the situation. Contrary to his usual idle self, he can become serious when it involves his friends or mission. Features: One of the Octagram Demon Lords, formerly belonging to the angelic side. Possesses high combat ability and hides strength unimaginable from his usual attitude.

Name: Clayman Race: Deathman (Marionette Master) Personality: Ambitious and fond of schemes, obsessed with making his plans succeed. Acts calm on the surface but easily becomes emotional when things don't go his way. Very concerned about his own status and reputation. Features: A man who once reigned as one of the Demon Lords. Specializes in information manipulation and schemes using others, working behind the scenes for his own ends. Became an enemy of Rimuru and caused a major disturbance involving the Demon Lords.