Questionable?

I want to write a story that will have a large fan base that I can get some feedback on but I don't seem to be chosing the write person (fan fiction wise) to write about. If I could get some feedback on here, anyone's opinion of who would be the best choice to write about, that would be wonderful. I want to write about someone and be passionate about it but every time I chose someone to write about, no one seems very interested and I lose all interest in the story because I get no feedback back from it.