| "Chaos" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin.|
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- Chaos (CosmicBreak) - An army of evil robots.
- Chaos (mythology) - the original god of Greek mythology.
- Chaos Heart - a dark artifact which possesses the power to destroy all worlds.
- Chaos (Sonic) - a strange water-like creature that uses the Chaos Emeralds to grow stronger.
- Chaos (Final Fantasy) - a powerful Demon God that serves as the ultimate evil in the Final Fantasy series including Dissidia: Final Fantasy.
- C.H.A.O.S. - a techno-terrorist group in the future.
- Chaos (SaGa) - a titan-like figure that acts as a villain in Final Fantasy Legend III.
- Chaos (Unlimited Saga) - the final boss of Unlimited Saga.
- Hundred-Faced High Priest Chaos - The priest of the Deboth Army and the main antagonist of Zyuden Sentai Kyoryuger.
- Chaos (Aladdin) - a cat-like deity which personifies the unpredictable and wreaks havoc in one episode of Aladdin: the Television Series.
- Chaos (Primal Rage) - a gigantic ape and god of decay.
- Chaos (AdventureQuest Worlds) - a powerful, unpredictable virus-like magic that can Chaorrupt (short for Chaos corrupt) objects and beings that is a recurring theme throughout AdventureQuest Worlds.
- Chaos (Sailor Moon) - The ultimate and final enemy of Sailor Moon and the Sailor Scouts, who is a powerful dark, formless being which has been the source of war and evil in the galaxy.