Karma Akabane (M) Yuma Isogai (M) Taiga Okajima (M) Hinata Okano (F) Manami Okuda (F) Megu Kataoka (F) Kaede Kayano (F) Yukiko Kanzaki (F) Masayoshi Kimura (M) Hinano Kurahashi (F) Nagisa Shiota (M) Sosuke Sugaya (M) Tomohito Sugino (M) Kotaro Takebayashi (M) Ryunosuke Chiba (M) Ryoma Terasaka (M) Rio Nakamura (F) Kirara Hazama (F) Rinka Hayami (F) Sumire Hara (F) Yuzuki Fuwa (F) Hiroto Maehara (M) Koki Mimura (M) Takuya Muramatsu (M) Touka Yada (F) Taisei Yoshida (M) Autonomously Intelligent Fixed Artillery (Ritsu) (F) Itona Horibe (M) ~Teachers~ Koro-sensei: Yellow, tentacled appearance. Homeroom teacher. Presumably male. Tadaomi Karasuma: Physical Education teacher. Ministry of Defense. (M) Irina Jelavić: English teacher. Professional assassin. (F)

A Demon Lord (Octagram) who was reincarnated as a slime. An extremely powerful individual who evolved from "Great Sage" and possesses Ultimate Skills like "Wisdom King Raphael" and "Gluttonous King Beelzebuth." He cares deeply for his friends and aims to build a peaceful nation as the leader of the Jura Tempest Federation. Basic Info: Name: Rimuru Tempest (Formerly Satoru Mikami) Race: Slime → Demon Slime (After evolution) Title: Chancellor of the Jura Tempest Federation, Member of the Octagram Major 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; 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 Great Spirit, now in a child-like form. Master of the Labyrinth (Dungeon). Leon Cromwell (Platinum Saber): A former Hero. A cold, calculating Demon Lord who acts rationally to achieve his goals. Luminous Valentine (Queen of Nightmares): Queen of the Vampires. Loves beauty and is a master of schemes working from the shadows. 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 strength when he gets serious.

Diablo: Race: Demon (Primordial Black). A top-tier demon with fanatical loyalty to Rimuru. Polite but overwhelmingly powerful. Benimaru: Race: Ogre / Kijin / Fairman. Commander-in-chief of Rimuru's forces. A reliable, red-haired warrior who is calm and sharp-witted. Shuna: Race: Ogre / Kijin. Benimaru's sister. Cute appearance, but a talented woman in charge of domestic affairs, magic, and clothing design. Scariest when angry. Shion: Race: Ogre / Kijin. Rimuru's secretary and bodyguard. A beautiful, well-endowed woman who loves fighting, but has a fatally bad sense of cooking (looks and tastes like poison). Ranga: Race: Star Wolf. Rimuru's loyal pet/wolf. Extremely faithful, usually hiding in Rimuru's shadow. Hakuro: Race: Ogre. A veteran white-haired swordsman. The master of martial arts who taught swordsmanship to Benimaru and the others.