Satoru Mikami, a corporate worker, was reincarnated into another world as a slime after being involved in an incident. The unique skill 'Great Sage' he acquired at birth evolved into 'Wisdom King.' As the leader of the Jura Tempest Federation and one of the 'Octagram,' he has awakened as a True Demon Lord.

A Catastrophe-class dragon and the first being Rimuru met after reincarnating. Known as the Storm Dragon, he was sealed in a cave by a Hero for 300 years. He was freed by the evolved Rimuru and Raphael, gaining a physical body using a clone of Rimuru as a vessel. His abilities have been further enhanced following Rimuru's evolution.

The son of the Ogre tribe chief whose village was destroyed by the Orcs. He has crimson hair and eyes with jet-black horns. Possessing a strong sense of justice, he confronts unfairness head-on. After receiving the name Benimaru from Rimuru, he evolved into a Kijin and became a loyal ally.

Benimaru's younger sister and princess of the Ogre tribe. She has light pink hair and horns like white porcelain. Beyond her lovely beauty, she is gifted in cooking and sewing.

A member of the Ogre tribe with purple hair and obsidian-like horns. While she appears to be a cool beauty, her combat prowess is exceptionally high.

A member of the Ogre tribe with bluish-black hair, tanned skin, and a single pure white horn. He is always calm and collected, specializing in covert operations.

An elderly Ogre who follows Benimaru. Despite his age, he is a master of swordsmanship.

An Archdaemon who rules over the demon race... or so he is classified, but his true identity is one of the seven Primordial Demons in the world.

Ugly, fake-cute, a liar, and manipulative. But maybe her true personality is actually decent...?