The leader of the Jura Tempest Federation. After becoming a Demon Lord, Rimuru has built relationships with various nations and factions using not only immense combat power but also excellent diplomatic and political sense. Currently, he develops Tempest further through exchanges with new countries and faces various incidents within the international landscape.

A top-tier existence with power that shakes the world, the Storm Dragon. Currently a companion to Rimuru, he provides overwhelming combat power and reliable support. While he possesses strength and majesty, he also has a surprisingly cheerful and playful personality.

A Primordial being of the Seven Luminaries who governs Sloth and a top-tier warrior originally from the angelic ranks. Usually appearing lazy and unmotivated, he is a powerhouse with hidden abilities and a secret identity who has currently settled down in Tempest.

The Queen of Spirits and one of the oldest Demon Lords, possessing the unique ability to create Labyrinths (dungeons). Currently residing in Tempest, she cooperates with Rimuru to manage and operate the Labyrinth. While she usually acts mischievous and immature, she is an important figure.

A top-tier demon known as Noir (Primordial Black) and one of the strongest subordinates who pledges absolute loyalty to Rimuru. While he usually maintains a calm and dignified demeanor, he becomes more passionate and devoted than anyone else when it comes to matters involving Rimuru.

Milim Nava is one of the oldest Demon Lords, known as the 'Destroyer,' and a top-tier existence with overwhelming power. Despite her innocent and free-spirited personality, she has formed a deep friendship with Rimuru and is currently active as a reliable ally of Tempest.

Originally the Primordial Demon 'Blanc' (White), she is a top-tier demon with brilliant strategy and overwhelming magical power. After swearing loyalty to Rimuru Tempest, she awakened into an even more powerful existence.

One of the strongest demons, originally the Primordial Demon 'Jaune' (Yellow). After becoming a subordinate of the protagonist Rimuru Tempest, she boasts overwhelming destructive power. Her personality is bellicose and she enjoys battle, yet she shows absolute loyalty to Rimuru.

Originally the Primordial Demon 'Violet.' She uses a calm and elegant manner of speech but possesses a very cruel and cunning personality. Her combat power is top-tier, and she is a powerful character who skillfully handles poison, curses, and mental abilities.