| "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 (mythology); The original god of Greek mythology.
- 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 (Aladdin); - a cat-like deity which personifies the unpredictable and wreaks havoc in one episode of Aladdin: the Television Series.
- Chaos (Castlevania)
- Chaos (Final Fantasy); A powerful demon god that serves as the ultimate evil in the Final Fantasy series including Dissidia: Final Fantasy.
- Chaos (Primal Rage); A gigantic ape and god of decay in Primal Rage.
- 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.
- Chaos (Sonic); A strange water-like creature that uses the Chaos Emeralds to grow stronger.
- 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.
- Kaos; A comedic character and the main, but often downgraded to secondary antagonist of the Skylanders franchise.