I've been thinking about Goosebumps books that would probably be better as Fear Street books. The first one that came into my mind was The Curse of Camp Cold Lake. The main villain, Della, seems to have a good background story, which makes me imagine a book like TCoCCL but longer, and with a prologue that told us Della's story with more details. The characters would also be older, of course.
I also thought of the books Be Careful What You Wish For and Revenge R Us.