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In Version 6, it is shown that a victim that an oni kills will become an Oni (鬼 Oni , lit. "Demon") themselves. The new "Character Onis" will turn against Hiroshi and chase him. These transformed Onis also seem to be able to transform back into the original character.
Their Oni forms are just ao oni with their hairstyle intact.
The movement and speed of the Transformed Onis are identical to the original Oni. All three can even appear as random chases just like the original. Towards the end of Version 6, this makes five different enemies that begin to appear at random. Note that if one Oni chase is activated, only scripted events can add another Oni.
Transformed Onis Edit
If you input Hiroshi's name as "JMU" in the name entry screen, Jon will be in the kitchen resting in the sofa. If you make the Oni chase Hiroshi to the kitchen and cease chasing, going back to the kitchen will make him turn into the JMU Ao Oni (jmu青鬼 jmu Ao Oni , lit. "JMU Blue Demon").
As Hiroshi is about to enter the basement, he hears Mika's screams from the kid's bedroom. As Hiroshi enters the room Mika was in, he sees the Oni supposedly eating her. Later on, Hiroshi will encounter Mika in the basement for a few seconds. She then morphs into Mika Oni (美香鬼 Mika Oni , lit. "Mika Demon") and chases Hiroshi around. Mika Oni in Ao Oni Mobile act strange in the Mysterious Old Man's Scenary, Mika don't attacks him, even though she's already a Oni, and you got too her mask if you end his scenary.
After Takuro was apparently caught by the Oni, he will later reappear and ask to join Hiroshi. Just before Hiroshi places the final blue piece into the frame which unlocks the exit door, Takuro turns into Takuro Oni (卓郎鬼 Takurō Oni , lit. "Takuro Demon") and pursues him.