Did You Know?
- In Tensura lore, receiving a 'True Name' is a transformative event — the monster evolves and gains intelligence, a unique appearance, and vastly increased power. The name itself is an act of creation, not just labeling.
- Rimuru Tempest's surname was gifted by Veldora, the storm dragon he befriended in the Cave of the Seal. Taking the same family name as a True Dragon is essentially a declaration that you belong to the same found family — which is exactly what Tensura is about at its core.
- Demon Lords in Tensura are technically not defined by evil but by having cleared a threshold of 'Harvest Festival' awakening — essentially becoming so powerful that the rules of the world apply to you differently. Several of the most powerful Demon Lords are explicitly good-aligned.
The Tensura Name Generator writes character names for the That Time I Got Reincarnated as a Slime universe — Named Monsters, Demon Lords, Kijin warriors, and Ancient Dragons — matched to whichever naming convention that race actually uses in the light novels and anime, not one generic "anime name" style stretched across everything.
If you landed here searching for a slime name generator with no Tensura connection at all, skip to the Slime/Rimuru-Type entries below — short, rounded, easy to say — and use those as a template for a D&D ooze, a Pokémon-style slime, or a slime girl character of your own.
Tempest's Founding Officers
Rimuru's inner circle, from the ogre village survivors to the demon who insisted on serving him.
| Name | Who they are |
|---|---|
| Rimuru Tempest | Slime; reincarnated salaryman Satoru Mikami, founder of the Jura Tempest Federation |
| Benimaru | Ogre-turned-Kijin; Tempest's "Samurai General," commands the army |
| Shion | Ogre-turned-Kijin; Rimuru's secretary and bodyguard, infamous for her cooking |
| Shuna | Ogre-turned-Kijin; Benimaru's sister, runs domestic affairs as Tempest's "Holy Princess" |
| Souei | Ogre-turned-Kijin; leads Tempest's spy network |
| Hakuro | Ogre-turned-Kijin; elder swordmaster who trains Tempest's soldiers |
| Kurobe | Ogre-turned-Kijin; blacksmith working weapons alongside Kaijin |
| Ranga | Direwolf pack leader's son; evolves into a Tempest Star Wolf, becomes Rimuru's mount |
| Gobta | Goblin evolved into a Hobgoblin; leads the goblin riders |
| Rigurd | Goblin evolved into a Goblin King; becomes Tempest's diplomat and administrator |
| Geld | High Orc named and evolved by Rimuru; becomes lord of the High Orcs |
| Kaijin | Exiled dwarven blacksmith from Dwargon; one of Rimuru's earliest trusted subordinates |
| Diablo | One of seven Primordial Demons ("Noir"); Rimuru's most devoted, most dangerous retainer |
| Treyni | Dryad guardian of the Great Forest of Jura; first warns Rimuru about the Orc Disaster |
The Octagram's Demon Lords
The council that governs Demon Lord politics — power measured in centuries, not levels.
| Name | Who they are |
|---|---|
| Guy Crimson | Demon; founder of the Demon Lord council, rules the Ice Continent |
| Milim Nava | Dragonoid Demon Lord known as "The Destroyer"; one of the three original Demon Lords |
| Leon Cromwell | Human summoned as a Hero, later recognized as a Demon Lord ruling El Dorado |
| Clayman | Deathman Demon Lord, the "Marionette Master" behind the Moderate Harlequin Alliance |
| Frey | Harpy Demon Lord who later stepped down from the council to serve under Milim |
| Dagruel | Giant Demon Lord whose three sons trained under Tempest |
| Carrion | Beastman Demon Lord and king of the "Beast Country," Eurazania |
| Luminous Twilight Valentine | Vampire; one of the oldest True Demon Lords, secretly rules the Western Holy Empire |
| Ramiris | Fairy Queen turned Demon Lord; oversees the Dungeon beneath Tempest |
Races Beyond Tempest: Lizardmen, Dwarves, and True Dragons
Everyone else the story spends real time on — sorted by species rather than allegiance.
| Name | Who they are |
|---|---|
| Gabiru | Lizardman chieftain's son; first named warrior of his tribe, evolves into a winged Dragonewt |
| Abiru | Chieftain of the Lizardman tribe; father to Gabiru and Souka |
| Souka | Gabiru's younger sister; evolves from Lizardwoman guard captain into a Dragonewt |
| Gobzo | Goblin rider trained by Hakuro; later revived as an undead "Death Onie" |
| Haruna | Goblina among Rimuru's handmaids |
| Garm | Eldest of three dwarf brothers; specializes in armor-smithing |
| Dord | Middle dwarf brother; oversees dyes and high-class attire |
| Myrd | Youngest dwarf brother; manages construction and architecture |
| Vesta | Former Dwarven Kingdom minister; later serves Tempest as Minister of Science |
| Veldora Tempest | Storm Dragon, one of five True Dragons; Rimuru's first friend in the new world |
| Velgrynd | Scorch Dragon, third-oldest True Dragon; later empress of the Eastern Empire |
| Velzard | Frost Dragon, second-oldest True Dragon; embodies deceleration and controls time |
| Testarossa | Primordial Demon ("Blanc"); co-leads Tempest's Black Numbers as a Daemon Lord |
| Ultima | Primordial Demon ("Violet"); recruited by Diablo, evolves into a Daemon Lord |
| Carrera | Primordial Demon ("Jaune"); joined the Black Numbers alongside Testarossa and Ultima |
Named Monsters and the Archdemons Serving Them
One tier below the Demon Lords, still well past "generic mook."
| Name | Who they are |
|---|---|
| Beretta | Greater Daemon inhabiting Ramiris's Golem guardian; evolves into an Arch Doll after being named |
| Adalman | Undead Wight Mage freed from Clayman's control; joins Tempest as a scholar |
| Kumara | Nine-tailed cryptid freed from Clayman; guardian of the Dungeon's 90th floor |
| Albis | Lamia leader of Eurazania's "Three Beastketeers"; skilled in poison and petrification |
| Phobio | Panther Lycanthrope of the Three Beastketeers; later possessed by the calamity Charybdis |
| Suphia | Tiger Lycanthrope of the Three Beastketeers; matches Shion in raw strength |
| Mezul | Equinoid leader; becomes joint guardian of the Dungeon's 50th floor |
| Gozul | Bovoid leader; rival-turned-co-guardian alongside Mezul |
| Veyron | Archdemon serving as Ultima's personal butler |
| Zonda | Archdemon and Ultima's youthful lieutenant |
| Esprit | Archdemon and Carrera's aloof attendant |
| Cien | Archdemon and Testarossa's obedient subordinate |
| Moss | Archdemon under Testarossa, undefeated for tens of thousands of years |
What Changes When a Monster Gets a True Name
Rimuru doesn't just label the monsters he meets. Naming someone triggers evolution — body, intelligence, and power shift at once. An unnamed orc is a threat. A named orc is a person with a future.
The scale of the habit is easy to undersell. Rimuru personally named the six ogre survivors who became Benimaru, Shion, Shuna, Souei, Hakuro, and Kurobe, instantly promoting them to Kijin. He later gave Kumara nine names in a single act.
That's the real question for an original character: has this creature been named yet, and by whom? Everything else about the name follows from the answer.
Three Naming Systems, Never Mixed
Tensura keeps its naming traditions strictly separated by race. Cross them and a name stops sounding like it belongs.
Authentic Japanese given names, unchanged before and after evolution
- Benimaru, Shuna
- Souei, Hakuro
Two-part invented-European names that land with zero extra decoration
- Guy Crimson
- Milim Nava
A shared "Vel-" prefix marking the same primordial bloodline
- Veldora, Velgrynd
- Velzard
Veldora Tempest — Storm Dragon, one of five True Dragons in the series
Run down Diablo's inner circle and a second pattern shows up. Wikipedia's own character list notes that Testarossa, Ultima, and Carrera are each named after a real sports car. Follow that thread and it keeps going: Veyron, Zonda, Esprit, and Cien land the same way — a Bugatti, a Pagani, a Lotus, and a Lamborghini concept, respectively, hiding behind demon titles. No single source spells out the whole group at once; it only shows up once you line all seven names up side by side.
Writing Original Tensura Characters
- Match race to convention: Kijin get Japanese names, Demon Lords get invented-European ones
- Decide if your monster has been named yet — pre- and post-Name versions should sound different
- Let a Demon Lord's name carry weight through simplicity, the way Guy Crimson does
- Reuse a canon name for your OC — Rimuru, Diablo, and Milim are unmistakably taken
- Give a goblin or Kijin an invented-European name — the series never crosses those lines
- Name a demon "Darkfang" or similar — the actual pattern hides in ordinary words, not menace
The kanji-driven foreshadowing behind Kijin names has a close cousin elsewhere in shonen — see how it plays out in the Jujutsu Kaisen name generator. Want a franchise where naming ties to an internal power rather than lineage? The Bleach name generator covers Zanpakutō and Soul Society conventions instead.
Common Questions
Is there an official name generator for That Time I Got Reincarnated as a Slime?
This one is unofficial and fan-made. It matches the naming logic in the light novels and anime by race and role — Named Monster, Demon Lord, Ancient Dragon, and so on — but Kodansha and author Fuse haven't published a generator of their own. Pick a race first; that field decides whether you get a soft slime-style name, a Kijin's Japanese one, or a Demon Lord's two-part invented one.
What makes a good slime name generator result, even outside the Tensura franchise?
Short and rounded works best — think Mirulo, Seiru, or Peluna rather than anything aggressive. Even Tensura's toughest evolved slimes keep a soft, approachable sound. That holds for a D&D ooze, a Pokémon-style slime, or a slime girl character with no franchise tie at all; menace reads wrong on a creature whose whole identity is being harmless and adaptable.
What Tensura names are already taken by named characters?
Every name in the tables above is canon and off-limits for an original character — Rimuru, Benimaru, Guy Crimson, Milim Nava, and the rest are instantly recognizable to readers. The generator is built to avoid near-duplicates of these, producing names that fit the same race and role without copying anyone specific.
Do all Tensura races use the same kind of name?
No — that's a rule the series never breaks. Kijin keep authentic Japanese names, Demon Lords lean invented-European, True Dragons share the "Vel-" prefix, and goblins stay short and punchy even after evolving. Mixing those up is the fastest way an original character stops feeling like it belongs in this specific world.
Sources
- That Time I Got Reincarnated as a Slime — Wikipedia
- List of That Time I Got Reincarnated as a Slime characters — Wikipedia
- That Time I Got Reincarnated as a Slime (TV series) — Wikipedia
- Tensei Shitara Slime Datta Ken — MyAnimeList
Updated September 2026: added 51 curated canon names across four tables (Tempest officers, Octagram Demon Lords, other races, and named monsters/archdemons), added a sourced stat-block and Sources section, rewrote the FAQ from real search queries, and added the supercar-naming detail behind Diablo's inner circle.
