Wikipedia:Fan analysis

This is an essay.

It contains the advice or opinions of one or more Wikipedia contributors. This page is not an encyclopedia article or a Wikipedia policy, as it has not been reviewed by the community.

There is an abundance of fancruft on Wikipedia. Fancruft generally falls into two categories:

Copyright violations: Stuff that's directly pulled from copyrighted material and is unoriginal to the point that it is a derivative work that cannot be released under the GFDL.
Fan analysis: Stuff that's pulled from copyrighted material, but created enough original fan analysis to the point that it is a derivative work which is unencyclopedic, but legal.

An example of this is the Back to the Future timeline. Is it an original work? If you say no, it is a copyright violation. If you say yes, then it is in violation of WP:SYNTH and should therefore be deleted.