Japan has some strange creatures.

A turtle-like monster that lives in rivers.

A fox that can transform into a human.

A long-nosed creature hiding in the mountains.

A cat that develops supernatural powers.

And an old umbrella...

with one eye, one leg and a tongue.

Yes.

An umbrella. ☂️👁️

Welcome to the wonderfully weird world of:

妖怪 — yōkai.

Yōkai have appeared in Japanese stories, folklore and art for centuries.

Some are terrifying.

Some are mischievous.

Some are mysterious.

And some are so ridiculous that you have to wonder what happened in old Japan for someone to invent them.

But yōkai aren't simply “Japanese monsters.”

They're something much more interesting.

So...

what exactly is a yōkai?

👹 What Does Yōkai Mean?

Yōkai (妖怪) is a broad Japanese term for strange, mysterious or supernatural beings and phenomena.

The word is written:

妖 — yō

associated with something mysterious, bewitching or supernatural.

And:

怪 — kai

meaning something strange, mysterious or suspicious.

Put them together and you get:

妖怪 — yōkai

But translating yōkai into English isn't easy.

You might see them described as:

monsters

spirits

demons

ghosts

or

supernatural creatures.

None of those is quite right for every yōkai.

That's because yōkai aren't one single type of creature.

They're an enormous supernatural category.

And that's where the fun begins.

👻 Are Yōkai Ghosts?

Not exactly.

Japanese folklore has another word commonly associated with ghosts:

幽霊 — yūrei.

Yūrei are generally spirits of deceased humans.

Yōkai are much broader.

A yōkai might be:

an animal with supernatural abilities,

a strange creature living in a river,

a mysterious presence in the mountains,

a transformed household object,

or something that doesn't fit neatly into any category at all.

So a useful beginner distinction is:

Yūrei = ghosts of the dead

Yōkai = strange supernatural beings and phenomena

Of course, Japanese folklore is old, complicated and full of overlapping categories.

The supernatural world doesn't always respect neat definitions.

🌙 Where Did Yōkai Come From?

Long before modern science could explain every strange sound in the forest or shadow outside the house...

people told stories.

Why did someone disappear near the river?

Maybe something lives there.

What's making that strange noise in the mountains?

Perhaps it's a supernatural creature.

Why did something move in the dark?

Well...

obviously the umbrella came alive. 😂

Folklore gave people ways to explain things that felt frightening, unusual or mysterious.

Stories were passed down.

Different regions developed their own creatures and legends.

And over time, artists and writers began giving those mysterious beings recognizable forms.

Suddenly the strange thing in the darkness had:

a name,

a face,

and a story.

🐢 Meet the Kappa

One of Japan's most famous yōkai is the 河童 — kappa.

These strange river creatures are often shown with webbed hands, reptilian features and a mysterious dish on their head—the source of their power.

Kappa can be playful, but older legends were much darker.

They may have also served as a warning:

Don't get too close to dangerous rivers.

Because there might be a kappa.

Effective parenting. 😂

🦊 Kitsune — Japan's Supernatural Foxes

Foxes appear everywhere in Japanese folklore.

They're called 狐 — kitsune.

But these aren't ordinary foxes.

Kitsune can shapeshift, create illusions and even transform into humans. Depending on the story, they can be mischievous, dangerous or protective.

They're also closely connected to Inari, a Shinto kami associated with rice and prosperity.

That's why you'll often see fox statues at Inari shrines.

The foxes aren't usually gods themselves.

They're messengers of Inari. 🦊

👺 Tengu — The Creatures of the Mountains

Then there are 天狗 — tengu.

Today, they're famous for their red faces and enormous noses, though older tengu were more bird-like.

They're strongly connected to mountains, martial arts and spiritual traditions—and can be dangerous, protective or powerful depending on the story.

If you see a red mask with a very long nose in Japan...

you've probably found a tengu. 👺

👹 What About Oni?

Horns. Fangs. Wild hair. Giant club.

Meet the 鬼 — oni. 👹

Often translated as demons or ogres, oni are some of Japan's most famous supernatural creatures.

They can be terrifying...

but modern oni can also be funny, clumsy or even cute.

You'll famously meet them during 節分 — Setsubun, when people throw roasted soybeans and shout:

“Oni out! Good fortune in!”

So if an oni attacks...

apparently the answer is beans. 🫘😂

🐱 Even Ordinary Animals Can Become Yōkai

This is where Japanese folklore gets especially interesting.

Sometimes an ordinary animal doesn't stay ordinary.

Cats, foxes, snakes and other animals can acquire supernatural characteristics in traditional stories.

One famous example is the:

化け猫 — bakeneko

literally a kind of:

changed / transformed cat.

These supernatural cats might:

speak,

take human form,

curse people,

or perform other mysterious acts.

There's also the:

猫又 — nekomata

another supernatural cat commonly depicted with a split or forked tail.

Which means that centuries before the internet discovered that cats were suspicious...

Japanese folklore already knew. 🐈😂

☂️ When Your Household Objects Come Alive

Now for one of the best parts of yōkai culture...

your stuff can become supernatural. 😂

Old objects that come to life are known as 付喪神 — tsukumogami.

One famous example is the 唐傘お化け — karakasa-obake: an umbrella with one eye, one leg and a long tongue.

Terrifying?

Not really.

Wonderful? Absolutely. ☂️👅

In the world of yōkai, almost anything can become a character.

🎨 How Yōkai Got Their Famous Faces

Folklore changes when someone draws it.

During the Edo period, artists produced illustrated collections and prints depicting supernatural creatures.

One particularly important figure was:

Toriyama Sekien.

His illustrated yōkai books helped catalog and visualize many supernatural beings.

And something fascinating happened.

Creatures that had existed in scattered stories and oral traditions suddenly had recognizable appearances.

People could see them.

Artists could reinterpret them.

New generations could rediscover them.

Yōkai weren't simply being preserved.

They were becoming characters.

And that idea feels surprisingly modern.

👀 Why Are Yōkai So Fascinating?

Maybe because they reveal something wonderfully human.

People encounter something they don't understand...

and create a story.

A dangerous river becomes home to a kappa.

A mysterious mountain becomes the territory of tengu.

A clever fox becomes a shapeshifter.

An old object becomes alive.

The stories make the invisible...

visible.

And over centuries, fear becomes folklore.

Folklore becomes art.

Art becomes entertainment.

Entertainment creates new characters.

The yōkai keeps changing.

But it never completely disappears.

❓ Yōkai FAQ

What are yōkai?

Yōkai (妖怪) are supernatural beings, creatures and mysterious phenomena found throughout Japanese folklore. The category is extremely broad and includes everything from animal shapeshifters to monsters and animated objects.

Are yōkai demons?

Not necessarily. Some yōkai may be frightening or dangerous, but others are mischievous, humorous or relatively harmless. “Demon” is too narrow a translation for yōkai as a whole.

What's the difference between yōkai and yūrei?

Yūrei (幽霊) generally refers to ghosts or spirits of deceased humans, while yōkai is a much broader category of supernatural creatures and phenomena.

Is an oni a yōkai?

Oni are their own well-established category in Japanese folklore, but they are also frequently discussed within the broader world of yōkai.

Are kitsune yōkai?

Supernatural foxes can be considered yōkai, although foxes also have religious associations, particularly as messengers connected with Inari worship.

Are yōkai still popular in Japan?

Yes. Yōkai continue to appear throughout Japanese manga, anime, games, movies, literature, tourism and character culture.

👋 Meet a JapPop Resident

Onigiri Oni

おにぎり鬼

Traditional oni can be enormous.

Terrifying.

Armed with giant iron clubs.

JapPop's oni?

He's mostly concerned about one thing:

his rice ball. 🍙👹

Onigiri Oni looks scary, but there's a simple rule for getting along with him:

Don't touch his onigiri.

Inspired by Japan's famous oni legends and one of its most beloved everyday foods, he's what happens when Japanese folklore meets the slightly strange world of JapPop.

👉 Meet Onigiri Oni and discover more residents of the JapPop Universe.

🇯🇵 About JapPop

At JapPop, we explore Japanese culture through playful stories, original characters and the wonderfully strange details that make Japan fascinating.

From yōkai and folklore to food, festivals, history, language and everyday life, every discovery opens the door to another story.

And with yōkai...

there are a lot of doors you probably shouldn't open.

But we're going to open them anyway. 👹

Discover Japan, one story at a time. 🇯🇵✨