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The main positive or life of HP novels are definitely the wide range of potential characters. It’s one of the reason the fanfictions are still made. The main characters(Harry, Ron, Hermione, Voldemort, Dumbledore, Snape, Draco,..)have too many potential than it is in canon.

Best Draco Malfoy FanFics

• Obsidian (Harry Potter Fan Fiction, Sequel to the Lazuli Trilogy) 195K 6.4K 14.
• Sapphire (Lazuli Book #3) – Harry Potter Fan Fiction (Draco Malfoy) 1.8M 56.6K 32.
• Lazuli – Harry Potter Fan Fiction (Draco Malfoy) 5.8M 157K 36.
• Emerald (Lazuli Book #2) Harry Potter Fan Fiction (Draco Malfoy)

Judging by the numbers on fanfiction[dot]net, Harry Potter stories seem to have the most fanfiction written about it. There are currently over 833,000 stories on the site.

Destiel is, as far as I can tell from the stats, the biggest ship on AO3 overall, with over 90,000 fics total.