Circle around him, grab the key, and leave. The Blob Oni will move slowly to chase you, and reveal the front door key. Simply walk past the bars of the first room and into the next room. Its appearance is the same as the oni in the ending of Version 5.2. The Teeth Oni looks nearly identical to the original Oni, but it has deadly sharp teeth and both of its eyes wide open. The Tall Oni is a regular Oni, but its sprite is stretched vertically. In the oni room however, it will not chase the player. Because of its size, it moves rather slowly in comparison to most onis.
Its rhythmic banging wakes Hiroshi from sleeping in the kid's bedroom. In Version 3.0, this Oni kills Mika by crushing her with its fists in this way. The Squatto, is a large, muscled Oni that can sometimes be seen banging its fists on the ground.
It floats back and forth without any other movement. The Satellite Oni has spike-like protrusions from its head and is capable of flight. The Hunchback Oni, mostly resembles the regular Oni, though its back is hunched over and it is bearing menacing teeth, it is also confirmed that Hunchback Oni is Teeth Oni it opens the gate of the Oni room when Hiroshi approaches it, then proceeds to chase him. The sprite for Encephalo Oni is crafted from the upper half of the original Oni's face, and it is jellyfish-like. The Encephalo Oni is sometimes also called the Jellyfish Oni, Octopus Oni, Calmar Oni or O-ging Oni. The Deformed Oni resembles the regular Oni, but the sprite itself is completely warped. It seems to be the Satellite Oni looking forwards. It levitates while staying affixed to its position, one of the thorns stretching and shrinking continuously. The Clock Oni resembles a clock with thorns, as if exploding, or a stalactite. It looks like a caterpillar with its head up and has five eyes on each side of its many-legged body. The Caterpillar Oni is a slow, sluggish monster. It can also replace the regular Oni (during randomly occuring chases) through use of the BLOCKMAN cheat. This monster has an odd attack pattern Blockman will sometimes freeze for a second and charge towards the player with twice the speed. From then on, Blockman can also appear randomly. In parts of the old building in Version 6.23, Blockman can actually appear and chase the player. The Blockman Oni, is the only monster seen in the Oni room that can be encountered during Version 6.23. However, since it is incredibly slow, it can easily be tricked and outrun. This Oni can chase the player in Version 3.0, where it is hiding the front door key. It looks like an amorphous mass with many eyes spread over its body. However no official origin for these freaks has ever been expressly outlined canonically. It has been shown that The Oni himself has an ability to transform the Protagonist's friends into other Oni with distinct visual elements of him. This implies some sort of a connection with the titular villain. While varying wildly in appearance, all Oni bear some visual elements similar to the main Oni, even if it's just color or eyes. The Oni room introduced a number of onis to the Oni universe. The Oni room was absent in Version 1.0 and omitted from Version 5.2. In here, the floor and walls are normal white wood. In Version 6.23, it is located outside of the mansion, in the basement of the old building. The enigmatic, mysterious feel of the room is marked by the strange, angular puzzle and the odd, blue squiggles adorning the floors. It is located at the top of the house, in the attic. In Version 3.0, the Oni room is actually composed of two separate rooms. Between Version 3.0 and Version 6.23, the Oni room switched buildings and appearance.