http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/TheDracoTrilogy

The Draco Trilogy was an epic Harry Potter Fan Fic series written by the Big Name Fan Cassandra Claire.note Yes, her, now a published author of the The Mortal Instruments series. She now spells her name Cassandra Clare, without an I. It's a pen name; she can do that. It used many of the same tropes found in The Mortal Instruments, and deviated wildly from Harry Potter canon because it was begun before the fifth book was released. The series consisted of three novel-length fanfics: Draco Dormiens, Draco Sinister and Draco Veritas. It began with a standard "Freaky Friday" Flip plot and developed into a complicated tale involving all sorts of magical inheritance, the four founders of Hogwarts and more.

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Notable for beginning the Draco in Leather Pants phenomenon, the story took Harry's rival Draco Malfoy and turned him into a sarcastic, leather-clad Anti-Hero best described as a combination of Corwin, Spike and Artemis Fowl. Became wildly popular in fandom to the point where some fans began to prefer the Draco Trilogy to the actual canon.

There was also a good deal of controversy in fandom when the author was blacklisted from FanFiction.Net for plagiarizing lengthy passages from a Pamela Dean series without attribution (and, apparently, lying about having permission to use the passages in her fanfiction, although she did sort of get permission after she was caught). This is often confused with the series using a large amount of quotes and scenes from TV series (including Buffy the Vampire Slayer and Blackadder) and several published works, which were (eventually) credited at the end of each chapter. Avocado, the person who first discovered and reported the Pamela Dean plagiarism, wrote here a recount of the plagiarism debacle.

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The author removed her fanfiction from the internet when she became a published professional, but rumor has it the Draco Trilogy can still be found online if you know where to look... for example, here , here , and here !

The Draco Trilogy provided examples of: