Pacific Rim AU: In which the characters are put into the world of Pacific Rim (most often as Jaeger pilots). This AU gained popularity due to the concept of Drift Compatibility that made for excellent shipping interactions.
Pen Pal AU: Is when two characters (who have met in canon) have not met each other in this AU. Sometimes they live in the area and other times they don't live on the same continent. Usually it is their school that sets them up as pen pals. If not, it is because one of the characters writes a letter to the wrong person/wrong address or they accidentally texts the wrong person.
Pirate/Merpeople AU: When the whole cast are pirates or some of the characters are pirates and the others are merpeople. Usually it is set in early nineteenth-century Europe. Sometimes it's pirates in outer space.
Prison AU: In which characters meet for the first time in an prison environment where they have to depend on each other.
Private Detective AU: When one of the characters becomes a professional detective while the rest of the cast are their clients or the detective's contacts in the police department (sometimes they work in other fields, in which the Detective character calls them in for favors to help solve difficult cases).
YOU ARE READING
The AU Dictionary
RandomA book explaining all of the different AU's. None of these belong to me. I got this from a blog I saw.
