Japan’s demons never needed fire and brimstone to be terrifying.
Some hide behind a beautiful face, some just wait quietly by a river, and a few genuinely ruled over mountains until a warrior showed up.
That real folklore is exactly why good demon names hit so much harder than generic fantasy words.

This guide splits into two halves, the same way our other Japanese naming guides do.
First, real demons and yokai pulled straight from Japanese mythology.
Then, a full set of demon names built the same way real Japanese demon words are built, so anime fans, Pathfinder players, and D&D dungeon masters all walk away with something usable.

Real Legendary Yokai And Demons

These aren’t invented, they come from centuries of Japanese storytelling.

• Shuten-doji, a demon king said to have ruled Mount Oe until the warrior Minamoto no Yorimitsu brought him down
• Ibaraki-doji, a fierce oni tied to Shuten-doji, famous for the legend of losing an arm at Rashomon gate
• Tamamo-no-Mae, a beautiful woman revealed to be a nine tailed fox spirit, later turned into a cursed killing stone
• Nurarihyon, an elderly yokai said to lead every other yokai, sometimes called their supreme commander
• Tengu, a mountain spirit known for a long nose or beak, tied to martial arts and mischief
• Kappa, a water dwelling yokai known for a water filled dish shaped hollow on its head
• Yuki-onna, the snow woman, a spirit tied to blizzards and frozen mountain passes
• Rokurokubi, a yokai whose neck stretches unnaturally once night falls
• Jorogumo, a spider yokai that lures victims by appearing as a beautiful woman
• Nue, a chimera like monster with a monkey’s head, a tanuki’s body, a tiger’s limbs, and a snake’s tail
• Baku, a spirit said to devour bad dreams and nightmares before they can take hold
• Gashadokuro, a giant skeletal yokai formed from the bones of the unburied dead
• Amanojaku, a small, mischievous demon tied to temptation and contrary behavior
• Namahage, masked demon figures from Akita who visit homes each New Year to warn misbehaving children
• Futakuchi-onna, a two mouthed woman yokai with a second mouth hidden beneath her hair

The Five Colors Of Oni

Here’s a detail most demon name lists skip entirely.
Traditional oni are often sorted by color, and each color is said to represent a different human weakness drawn from Buddhist teaching.
Red stands for greed and desire, blue for anger and hatred, black for doubt, and green or yellow for imbalance and indecision.
The most famous pairing shows up in the folk tale of Akaoni, the red demon, and his loyal friend Aooni, the blue demon, a story still told to children today.

Real Demon Vocabulary Worth Knowing

• Oni, the general word for a Japanese ogre or demon
• Yokai, the broader term covering demons, spirits, and supernatural creatures of every kind
• Akuma, a word closer to devil, often used for a more purely evil spirit
• Mononoke, a vengeful or restless spirit
• Majin, literally demon god, a real word used for a powerful or magical being
• Kijin, another real term meaning demon god or ferocious deity
• Youma, a real word for a demon or monstrous spirit

How To Build Your Own Demon Names

Once you know the real vocabulary, building your own demon names gets easy.
Take a root word, an element, a color, or an image, and pair it with a real demon ending like oni, ma, or jin.
Onimaru, a real historic sword name, and Kijin, a real standalone word, both follow this exact idea.

Common roots: yami (darkness), chi (blood), kuro (black), rai (thunder), kage (shadow), yuki (snow), tsuki (moon), hoshi (star), sora (sky), umi (sea), yama (mountain), mame (bean, used for something small), chibi (tiny), hana (flower), aku (evil), ja (serpent), doku (poison)

Cool And Powerful Demon Names

• Yamioni (darkness demon)
• Chioni (blood demon)
• Kuroma (black demon)
• Raima (thunder demon)
• Kijin (demon god, a genuine Japanese word)

Anime Style Demon Names

Short, punchy, built for a character sheet or a screen.

• Majin (demon god, a real word used across anime and games)
• Youma (demon or monstrous spirit, a real term)
• Jaki (a real word for evil or malevolent energy)
• Kurojin (black deity, kuro plus jin)
• Onimaru (a real historic naming pattern, demon plus maru)

D&D And Pathfinder Demon Names

Built for tabletop villains, boss fights, and campaign lore.

• Akuja (evil serpent, aku plus ja)
• Madoku (poison demon, ma plus doku)
• Onibi (demon fire, a real term for the spectral flames of Japanese folklore)
• Jaou (serpent king, ja plus ou)

Read More; 630+ Leshy Names for Pathfinder: Creative, Mythical, Funny & Cool PF2E Ideas

Cute Demon Names

Yokai aren’t always terrifying, plenty of modern stories lean into a softer, more playful side.

• Mameoni (bean sized demon)
• Koni (small demon)
• Chibioni (tiny demon)
• Yukioni (snow demon)

Unique Demon Names

• Reima (spirit demon)
• Tsukima (moon demon)
• Hoshima (star demon)
• Yamijin (darkness deity)

Female Demon Names

• Yukihime (snow princess demon)
• Hanahime (flower princess demon)
• Kurohime (black princess demon)
• Akahime (red princess demon, a nod to the red oni of folklore)

Unisex Demon Names

• Kageoni (shadow demon)
• Soraoni (sky demon)
• Umioni (sea demon)
• Yamaoni (mountain demon)

Tips For Picking The Right Demon Names

Think about the demon’s role before the sound of the name.
A trickster fits Amanojaku’s energy far better than a giant skeletal terror like Gashadokuro.
Say the name out loud in a full sentence, since a few of these can feel malevolent on paper but land softer when spoken.
If you’re building a whole cast, mix a few real yokai in with your invented ones, since that blend is exactly what keeps Japanese horror and fantasy stories feeling grounded.

Frequently Asked Questions

Are these real historical demon names?
The yokai and legendary demons section lists real, documented figures from Japanese folklore.
The cool, anime, D&D, cute, unique, female, and unisex sections are creative demon names built from real Japanese words, following the same patterns real Japanese naming actually uses.

Are Japanese demons the same as Western demons?
Not quite.
Many yokai are more mischievous or tragic than purely evil, and quite a few, like Baku, are actually protective rather than harmful.

Can I use these demon names for a D&D or Pathfinder character?
Yes, several sections here were built with exactly that use in mind.

Do the word meanings behind these demon names check out?
Yes, every root and ending listed carries a genuine Japanese meaning, shown next to the name it forms.

Final Thoughts

Strong demon names come from the same place strong monsters always have, real stories that made people believe in them.
Shuten-doji, Nurarihyon, and the red and blue oni of folklore have survived centuries for a reason, and the created demon names above borrow that same real language for whatever villain or character you’re building next.

Pick a root that matches the personality behind your demon, pair it with oni, ma, or jin, and say the full name out loud before it becomes official.