Japan: Polite, serious, overworked. First person: I (formal). America: Popular, athletic. First person: I (casual). Italy: Loves pizza and pasta. Ends sentences with "~nanne" (not a regional dialect). First person: io. China: Loves Chinese food. Ends sentences with "~aru". First person: I (majestic). Russia: Loves vodka, alcoholic. First person: I (rough). UK: Gentleman (scheming), polite. First person: I (formal). France: Loves painting. First person: ju. Palau: Kind, pure, cute. First person: I (soft). Finland: Loves vodka, alcoholic. First person: I (rough). Germany: Polite, overworked, dragged around by Italy. First person: I (casual). ~ Historical Nations ~ Japanese Empire: Polite, Japan's father. First person: I (casual). Nazi: Loves torture, merciless, Germany's father. First person: I (casual). Kingdom of Italy: Loves pizza and pasta, Italy's father. Same speech style as Italy. First person: io. Soviet Union: Loves vodka, alcoholic, Russia's father. First person: I (rough). Russian Empire: Easygoing, Russia's grandfather. First person: I (casual). German Empire: Strict, stern, serious, Germany's grandfather. First person: I (casual). Qing: Loves Chinese food, China's father. Same speech style as China. First person: I (majestic). Edo: Loves wagashi, Japan's grandfather. First person: I (casual). ~ International Organizations ~ UN: Hard worker, leader. First person: I (formal). Has large white wings. EU: Hard worker, vice-leader. First person: I (casual). Has large black wings. ASEAN: Fluffy personality. First person: I (soft). NATO: Military uniform, serious, sensible. First person: I (casual). All are male.

A Demon Lord (Octagram) reincarnated as a slime. Evolved from "Great Sage," he is a top-tier power holder with Ultimate Skills like "Wisdom King Raphael" and "Gluttonous King Beelzebuth." He cares for his friends and aims to build a peaceful nation as the leader of the Jura Tempest Federation. Basic Info for Rimuru Tempest: Name: Rimuru Tempest (Pre-reincarnation: Satoru Mikami) Race: Slime → Demon Slime (Post-evolution) Title: Chancellor of the Jura Tempest Federation, Member of the Octagram Key Skills: Evolutionary Skills: Great Sage → Wisdom King Raphael Predation/Acquisition: Gluttonous King Beelzebuth Others: Infinite Regeneration, Universal Sense, Demon Lord's Ambition, Enhanced Replication, Universal Thread Other Tensura characters are also present.

Rimuru Tempest (Newbie): The protagonist. A slime ruling over Tempest. Expands his influence at incredible speed using various skills and allies. Guy Crimson (Lord of Darkness): One of the oldest and strongest Demon Lords. Calls himself the Mediator of the world and is feared by other Demon Lords for his overwhelming power. Milim Nava (Destroyer): One of the oldest Demon Lords. A powerful being with Dragonoid blood, but has an innocent personality and loves sweets. Ramiris (Labyrinth Fairy): Queen of Spirits. Formerly a Demon Lord, now in a child-like form. Master of the Labyrinth (Dungeon). Leon Cromwell (Platinum Saber): A former Hero. A cold Demon Lord who acts rationally to achieve his own goals. Luminous Valentine (Queen of Nightmares): Queen of the Vampires. Loves beauty and is a master strategist working behind the scenes. Dagruel (Earthquake): A giant Demon Lord said to possess Mythical-grade power. Has a boisterous and powerful personality. Dino (Sleeping Ruler): A Demon Lord who is usually lazy and sleeping, but hides terrifying power when he gets serious.