The Seraphic Trilogy is a Miitopia AU created by StaryStorm encapsulating the events of three games (one official, two fanmade): Miitopia, Miitwopia, and Threetopia. However, since the latter two aren't actually real games, the story is told in a set of light-novel-eqsue fanfictions for effeciency's sake. The point of the fics are to feel as close to real light novel adaptations of the games as possible. You can read all about the Seraphic trilogy here.
unfortunately, due to a large amounts of other projects on my plate, the Seraphic Trilogy is on hiatus.