Do you love Homestuck because of its wonderful complexity?
Maybe you love Avengers for bringing the long comic book history to life on the big screen.
Then again, Doctor Who has 50 years of television history and a backstory that spans all of time and space.
Or perhaps you'd make a deal with a crossroads demon to live in the Supernatural world.
We know there are countless other fandoms out there. Tell us which one you're totally obsessed with and why it's the best in the comments below!