No Human AU: Also known as Animal AU, is the opposite of All Human AU, in which characters that are canonically human are now non-humans.
Noir Detective AU: In which the characters are put in a typical 40's or 50's film noir environment. Or sometimes as a homage towards the style, in which the characters are still their canon selves, but plot or aesthetics are given a noir slant.
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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.
