They might simply be huge fans of the series. Just because they are in Slytherin doesn't mean they can't enjoy the expanded world of Harry Potter through fanfiction. It could also be a way to pass the time and engage with other fans' creativity. They can find new adventures and relationships between characters that add more depth to their understanding of the magical world.
One reason could be that they want to explore different perspectives within the Harry Potter universe. Fanfiction often offers unique takes on the characters and storylines. Maybe they're interested in seeing how Slytherin characters are developed further or redeemed in ways that the original books might not fully explore.
Well, they might find it really interesting. They could discover new perspectives on the characters. Maybe they'll start to see Harry and his friends in a different light, and it could even change their views on the Gryffindor - Slytherin rivalry a bit.
I really like 'A Slytherin's Heart'. In this fanfic, the female Slytherin character has a complex personality. She and Harry start off as rivals but gradually grow closer. The author does a great job of exploring the Slytherin house values through her character, and the relationship between her and Harry is filled with lots of tension and chemistry.
One reason could be to show a more complex side of Harry. By making him the heir of Slytherin, it blurs the lines between the houses and shows that he has qualities from different aspects of the wizarding world.
Well, it might be because some fans feel that Slytherin has been somewhat demonized in the original books. So, they create fanfiction where Slytherin is the victim of abuse, perhaps as a way to give the house more depth and sympathy. Also, the idea of abuse can create a lot of drama and conflict, which are elements that make a story interesting. Fanfiction writers might be using this concept to attract readers who are interested in more complex and edgy storylines. Additionally, it could be a form of exploring the morality and ethics within the Harry Potter universe in a very extreme way.
Some fanfictions explore the concept of a female Harry Potter having a connection with Salazar Slytherin in unique ways. For instance, in 'The Female Gryffindor and the Slytherin Founder', the female Harry, while being a Gryffindor, discovers a hidden bond with Slytherin. It might involve her uncovering ancient secrets or spells that were related to him. Also, 'Slytherin's Influence on Female Potter' shows how his ideals and values might shape a female Harry's journey, especially in a world where she has to face different challenges than the male Harry in the original books.
One interesting fanfiction could be 'The Slytherin Prince Harry'. In this story, Harry's sorting into Slytherin changes his whole Hogwarts experience. He has to deal with the prejudice from the Gryffindors while also trying to find his place among the Slytherins. It shows a different side of Harry, more cunning and politically aware.
For entertainment. Just like anyone else, Slytherin students would be interested in exploring different stories set in the Harry Potter universe.
Maybe because some fans want to explore a different side of Harry. By making him the 'king' of Slytherin, they can show how his character could adapt and thrive in a different house's environment.
Well, in some fanfiction, Harry might annoy everyone because he could be written as overly self - righteous. He's the hero in the original series, but if a writer wants to explore different angles, they might make him constantly spout off about what's right and wrong in a really grating way.
The 'Harry Potter' series is far from being a 'criminal fanfiction'. J.K. Rowling created a magical universe filled with positive values. Harry and his friends are constantly fighting against the real criminals in the story, like Voldemort and his Death Eaters. It's a story about good triumphing over evil, not about criminality.