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Crossover Index

Crossovers occur any time characters from one work "cross over" into another. Any time characters from one work interact with another work, you have a crossover.

This is extremely common in Fan Fic, where the authors take someone else's characters and play with them, often introducing a new setting or new characters in order to better facilitate the story they want to write.

This is an index of the varying types of crossovers; Rule 50 may apply to some of these.