Rimuru Tempest

Species: Demon Slime (Demon Slime) → Ultimate Slime (Ultimate Slime)

Affiliation: Jura Tempest Federation (Federation of Magical Nations)

The protagonist of this work. Satoru Mikami, a Japanese salaryman (voiced by Takuma Terashima), is stabbed to death by a random attacker and reincarnates as a slime monster. The "previous life" of Rimuru in the story refers to the time when Satoru Mikami was alive. He was a university graduate and worked for a major general contractor.

In the cave where he reincarnated, he met Veldora, the Storm Dragon, and by exchanging names, he became a "Named Monster." By absorbing Shizue, a fellow countryman he first connected with in the reincarnated world, he gained the ability to mimic a human form. His human appearance is more feminine, but biologically he is asexual, and his mentality remains the same as his previous life, so his speech and mannerisms are masculine.

He is fundamentally a light-hearted and gentle pacifist, and even during his salaryman days, he had a personality that couldn't say no when relied upon. He thinks of the named subordinates as family and has the ruthlessness to not forgive those who hurt his comrades. He has a genius talent for charming people, and his subordinates carry out even the most unreasonable orders with a smile, which leads him to get carried away easily, become overly passionate, ignore corrections, jump to wrong conclusions, and make decisions without thinking ahead, often regretting them later.

His basic principle of action is "to create a country where everyone can live comfortably and enjoyably, regardless of race," and as a result of pursuing this principle, the living standards of the magical nation federation founded by Rimuru eventually reach a level comparable to most other countries. On the other hand, he believes that freedom of thought, speech, and expression should be guaranteed to foster diversity and develop culture (entertainment), so he does not harbor ambitions like world conquest.

In terms of relationships, Veldora is his first friend and sworn brother, sharing a soul corridor, and his greatest ally. He is best friends with the Demon Lord Milim, a fellow disciple of Dwarf King Gazel, and a scheming buddy with the Heavenly Emperor Elmesia.

Game creator Masanobu Endo has commented on the slimes in this work, stating that rather than simply reversing the "slime=weakest" image, he felt it represented the author's unique worldview.