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.