This is a category for characters who are regarded as antagonists (individuals who are actively opposed and hostile to the protagonist) in the fan-fictions where they originate from. Take note that an antagonist does not need to be evil, but simply needs to be in opposition to the protagonist of the story.

In a story where Voldemort (still following his canonical personality and goals) is the protagonist, then the antagonist of the story would be, for example, Albus Dumbledore or Harry Potter.