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The Oni (sometimes known as Onis) are a vicious race of demonic beings that inhabit the Netherrealm and one of the many known speicies in the Mortal Kombat universe.
- The term Oni comes from the demons of the same name in Japanese folklore.
- Quan Chi was once an Oni, until he became a demon with his mastery over sorcery.
- The common Oni in Deception is dressed like Quan Chi from Deadly Alliance onwards.