June 27th, 2014 at 07:56pm
I would just call it fanfiction. Almost half of every fanfiction out there has original elements or original plots. I do that all the time because I like making my fanfictions as original as I can get.
Good luck on your story!
I would just label it as original and put inspired by.... Since you have so much that you're going to change. Plus I agree that you would attract more readers like that.