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The Ao Oni is the enigmatic titular main antagonist of Ao Oni. It is a creature who lives in the abandoned mansion on the outskirts of town. Not much is known about the Oni, but it comes from a world with many creatures that resemble it.


The Oni is an enigmatic creature that lives in the abandoned mansion on the outskirts of a town in Japan. Not much is known about the Oni, but it lives with many creatures that resemble it. It is known to feed upon people. In Version 6.23 it has been shown that after the Oni kills, the victim becomes an Oni themselves. It seems to act like a virus, when the "virus" interacts with a sentient creature, within moments it can turn them into a horrific monstrosity, as exampled with a pregnant cat in the original game.


Ao Oni appears as the main antagonist in the Ao Oni novel series, where Shun is a dejected transfer student who could not fit in with the rest of his class. When the rumors started to go around of a monster had appeared in a western-styled jailhouse, he encountered Hiroshi and his friends, and they set foot inside the mansion. Later on into the series, Hiroshi is the main protagonist and must save Takuro and the others with Shun and Anna's help.


The Oni is a lavender humanoid creature with a large distorted head that vaguely resembles a human. It sports large, glassy eyes, a bent nose, and a tiny, featureless body. It always has the same bemused expression on his face. The back of its head is black suggesting that he either has black hair or rather just the dim lighting.

In version 5.2, the Oni takes a more threatening appearance in Takeshi's nightmare, should you get the best ending. In the nightmare, the Oni's eyes are more similar in appearance and is baring its teeth. With its mouth open, the player can see that the Oni has sharp teeth as well as tusks.

Movie appearance

Ao Oni in the movie.

In the live-action movie adaptation, however, there are some noticeable changes in Oni's appearance. While its head remains large and distorted, its face is less distorted with green eyes with crude slits, and having a feral expression instead of remaining bemused over the course of the movie. Oni in the movie has sharp teeth like in version 5.2 but lacks tusks and smaller but more numerous. Oni's right hand is larger in the movie, and Oni is indeed bald. Its skin is also crude in appearance.


Oni was shown to remain emotionless in spite of followed by murderous instinct to kill anyone who entered its mansion. It's also shown to have considerable intelligence, as it is able to hide within closets, fireplaces, in the dark, ambush its prey out of unexpected places, etc.

In the movie, it was given more personality while retaining its intelligence and murderous instinct. Here, it displayed sadistic, ferocious, and aggressive tendencies, as it enjoys moments of its victim's fear as he attacking and intimidating it's prey by mimicking their friends' voices.

Powers and Abilities

It is known to feed people and transform. Specifically, in versions 6.22 and 6.23, it has been shown that after the Oni kills, the victim becomes an Oni themselves, turning against the main protagonist, in this case, Hiroshi. These transformed Onis also seem to be able to take the form of the original character. This is shown when "Takuro" asked Hiroshi if he could go with him when Hiroshi goes to put the blue piece on the paper, Takuro turns into a Character Oni and chases Hiroshi. In their true forms, Oni retains the hairstyle of their former disguise.

In the movie, Ao Oni has the ability to turning victims into another Oni was replaced with the ability to mimic their prey's voice and even is able to speak Japanese fluently. This likely because Ao Oni in the movie feasts upon the victims' body outright and often, if not always, only left their mutilated corpses.

Oni Room

Different Oni types in the room.

In the Ao Oni game, there is a room named Oni Room. Once you enter it, you'll find different types of Onis:

  • Blob Oni
  • Blockman Oni
  • Caterpillar Oni
  • Clock Oni
  • Deformed Oni
  • Encephalo Oni
  • Hunchback Oni
  • Satellite Oni 
  • Squatto 
  • Tall Oni
  • Teeth Oni




- Ao Oni's chase theme


  • Although Ao Oni means "Blue Ogre", many people refer to it as "Blue Demon" or "Blue Troll".
  • In-game, even though it is named "The Blue Ogre/Demon", its coloring is actually closer to a lavender hue. It is unknown whether it was a sprite error or intentional. It is possible that "Ao/Blue" could simply be a proper name, and not a description of his actual color.
  • According to the ending of the game, the Oni sees through a form of thermal-based vision, similar to the titular alien from the movie "Predator". However, he was given a normal vision in the movie.
  • Ao Oni in the movie often nearly loses its balance during chase scenes in the movie, unlike in-game where it can run like a human does. This is because the Oni's head in the movie is apparently heavier than the rest of his body and given a more realistic look.
  • Ao Oni's voice is briefly heard in one of the versions but as unidentified whispering sounds. In the movie, Ao Oni can speak human languages and can mimic the voices of it's victims.
  • It's unknown if Ao Oni is the owner of the mansion or the owner was killed by Ao Oni.
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