Her name was Ebony Dark’ness Dementia Raven Way: vampire, witch, time traveler, sex bomb. Five years after the turn of the 21st century, fan fiction had long since migrated online, and many writers had coalesced around the sweeping FanFiction.net archive, thought to have nearly 1.2 million accounts in 2006. Following these were inevitable parodies in the tradition of “A Trekkie’s Tale,” which created and skewered the wish-fulfilling “Mary Sue.” And then there was something more enigmatic: fiction so bad it was barely readable, created by authors who straddled the line between fictional characters and real-world trolls. But 2006 would prove a turning point: it was the year of Harry Potter fan fiction “My Immortal,” written by a teenager named Tara Gilesbie.