A fanfic
Fanfic is a made-up story someone writes about people they like from a book, show, or game. They don’t care if the original author would be horrified.
A fanfic I read had Harry Potter and Draco Malfoy falling in love. It was sweet but also weird.
My brother wrote a fanfic where Mario and Link went on a road trip. It had a lot of cheese and a lot of fighting.
I once read a fanfic where Goku married Thanos. It was confusing but also kinda cool.