I thought I would mention this in here, as over the years I have noticed that a lot of requests are for stories based on things from other media. Like books, movies, comics, or TV shows.
In the "Authors Hangout" there is quite a discussion right now on that very topic. And in case it has not been noticed, most of of the authors tend to avoid doing such because of the risks involved legally.
In short, an author needs to be very careful when "adapting" an existing work and writing a story around it. Because if they are not, they (and this site) could literally be sued for doing it.
Now this can be avoided, but it also depends on the original work, and how much of the story is "original content", as well as the intent of the story. But a great many of us will simply not do it, for a great many reasons.
Myself, I will not do it because I hate working within the restrictions of characters and setting created by others. In over 25 years of writing, I have only created a single "fan fiction" story, and that was over 2 decades ago. And I can not imagine my ever writing another one.