One reason could be her thirst for knowledge. Slytherin was known for his cunning and knowledge of magic. Hermione might be drawn to his intellectual side. Another reason could be a desire to break the traditional house rivalries. By becoming a fan of Slytherin, she could promote unity among the houses.
Well, Hermione is highly intelligent and Salazar Slytherin was also a very intelligent wizard. In fanfiction, she might admire his ambition and the way he built his house. Maybe she discovers that some of the negative views about Slytherin were misconstrued over time. Also, if there was a plot where she needed to understand the roots of dark magic and Slytherin had some connection to it, she could become a fan in the process of research.
Yes, there are likely some fanfictions out there. In the Harry Potter universe, Hermione is a Gryffindor, but fanfiction often likes to play with the idea of characters having different allegiances or interests. Some writers might explore a scenario where Hermione has an unexpected admiration for Salazar Slytherin, perhaps delving into the history and values of Slytherin house that she could potentially respect, despite the traditional Gryffindor - Slytherin rivalry.
One plot idea could be that Hermione discovers a long - lost spellbook of Salazar Slytherin. As she delves into it, she starts to understand his view of magic in a new way. Maybe the spells in the book are different from what she has learned before, and she has to struggle with whether to use them or not, given Slytherin's somewhat dark reputation.
Perhaps in a parallel universe, the Hogwarts founders had different relationships. Hermione discovers this parallel world where she and Salazar are destined to be together. She has to fight against the norms of both worlds to be with him. This could involve battles against traditional pure - blood ideas in Slytherin's world and modern prejudices in her own world.
Hermione could be developed by having her gain some of Slytherin's traits, like his cunning and resourcefulness, in a way that doesn't compromise her Gryffindor values. She could use these new - found traits to solve problems in Hogwarts. Salazar Slytherin's character could be developed by making him more relatable. For example, if he had a love interest in the past that influenced his views, and Hermione discovers this through her research in the fanfiction.
A fanfiction could depict Hermione being magically bound to Salazar Slytherin's spirit. They are forced to work together, and Hermione has to find a way to communicate with him. It would be interesting to see how she reacts to his archaic views and tries to change them while also dealing with the challenges of the magical bond.
There are definitely some out there. For example, in some fanfictions, Hermione might find an ancient artifact that was once Salazar Slytherin's and it unlocks a whole new side of her. It could be that she discovers she has some Slytherin - like traits that she didn't know about before, and the fanfic could then explore how she deals with that in the context of her Gryffindor identity and her relationships with her friends at Hogwarts.
A common plotline involves Hermione unlocking some sort of hidden power or knowledge that was left behind by Salazar Slytherin. For example, she might discover a long - lost spellbook of his and learn some powerful magic from it. Another plotline could be that she is chosen by some ancient Slytherin - related magic to carry out a task that has been long forgotten, which could put her at odds with some of the Hogwarts faculty or her friends initially as they misunderstand her intentions.
Well, it's fairly popular. Many fans are drawn to the idea because it challenges the traditional view of Hermione as a Gryffindor. It gives a chance to explore how the traits associated with Slytherin, like cunning and ambition, could be part of Hermione's heritage. This concept also opens up the possibility of new relationships and rivalries within the fan - made stories, which makes it appealing to those who like to explore different aspects of the Harry Potter world.
One possible fanfiction could be about Hermione time - traveling back to the time of Salazar Slytherin. She might use her intelligence to understand his motives for creating Slytherin house. Maybe she tries to convince him to be more inclusive in his views, as she is a strong advocate for equality in the wizarding world.
Maybe she leaves because of a conflict. It could be with a teacher who doesn't support her unorthodox ways of learning or a fellow student who makes Hogwarts an unpleasant place for her. In fanfiction, there could be a lot of creative interpretations of such conflicts.