Undocumented Features was one of the first
anime fan fiction stories to hit the Internet, shortly after
Larry Mann's
Dirty Pair fanfic,
Experiment 101-E. As such, it has had no small degree of
influence over the subsequent anime fanfic scene.
Though not intended to be in the beginning, Undocumented Features soon became a perfect example of a shared universe setting...too shared; soon after the first couple of stories came out, the Eyrie Productions crew discovered everybody and his sibling wanted to write a UF story.
The Eyrie Productions website can be found at http://www.eyrie.net...not to be confused with The Eyrie, http://www.eyrie.org, Russ Allbery's personal homepage.