An oni is an evil spirit who takes humanoid form to become a native outsider. All oni have the following traits, unless otherwise noted in a specific creature's entry.

• Darkvision 60 feet and low-light vision.
• Change Shape (Su) All oni are shapechangers with the shapechanger subtype, but an oni takes only other shapes similar to its normal humanoid form.
• Humanoid Shape: As evil spirits clad in humanoid flesh, all oni possess a humanoid subtype.
• Regeneration (Ex) The rate of regeneration and damage type that suspends it depends on the type of oni, but is typically acid or fire.