Author has written 4 stories for Lord of the Rings, Supernatural, and Star Wars.
Note. I don't do slash. Sometimes, people really are just friends.
Just a word about my favorites:
I've been obsessively reading fanfiction for years and I've read a lot of phenomenal stories. My favorite stories are ones that I loved just as much the second and third reading as I did the first. So you don't have to slog through 70-plus favorite to see if any match your fandom preferences, they include LOTR, Stargate Atlantis, Star Wars, and Supernatural, along with a smattering of Chronicles of Narnia, Suits, NCIS, Sherlock Holmes (and Sherlock), Avengers, and Star Trek.