I really liked a fanfic where the Slytherin descendant is a girl who discovers her heritage and tries to change the perception of Slytherin in Hogwarts. It shows how she uses her Slytherin traits like cunning and resourcefulness in positive ways. She forms alliances with students from all houses and they go on adventures together. It's a really heartwarming story.
One interesting fanfiction could be 'The Slytherin Ascendancy'. In this fic, Slytherin is portrayed as a shrewd political lord who uses his cunning to navigate the wizarding world's complex political landscape. It delves into how he might have used his House values in a more political sense, like networking and strategic planning.
There's a fanfic titled 'Slytherin Portraits: Guardians of the Past'. In this story, the Slytherin portraits act as guardians. They test the new Slytherin students in unique ways. For example, they present riddles that are based on Slytherin's values and the history of the house. It's really interesting how the author weaves the portraits into the fabric of the Slytherin house experience.
A really well - written fanfiction on this topic is 'When Harry Becomes Salazar Slytherin Reborn'. The story is great because it not only focuses on the power that Harry gains from this rebirth but also on the moral dilemmas he has to face. He has to decide whether to follow the more extreme Slytherin values of old or to blend them with the more modern values of the wizarding world he grew up in. This creates a lot of internal conflict for Harry which makes for a very engaging read.
One great fanfiction in this vein is 'The Slytherin Twin'. It delves deep into the relationship between Harry and his twin sister in Slytherin. The story shows how she has to navigate the house's reputation while still being family with Harry. Another is 'A Twin's Tale in Slytherin' which focuses on her adventures in the Slytherin common room and her friendships there.
One interesting fanfiction could be 'The Slytherin Legacy'. In this, Harry Potter's older Slytherin brother has to navigate the complex world of Hogwarts. He struggles with the family's expectations and the Slytherin house's reputation. Another one is 'Brother in the Shadows'. It shows how he tries to protect Harry from afar while dealing with his own dark desires that come with being a Slytherin.
One great Slytherin - Harry Potter fanfiction is 'The Slytherin's Heir'. In this story, Harry discovers his connection to Slytherin in a very unique way. It shows a different side of the Slytherin house, not just the typical 'evil' image. The characters are well - developed, especially the Slytherin students who befriend Harry. It's a refreshing take on the Harry Potter universe.
One great 'Harry Potter Slytherin sister fanfic' is 'The Slytherin Heir'. It has an interesting plot where the sister is trying to break free from the stereotypes associated with Slytherin. She forms unexpected friendships and has her own adventures within the wizarding world that are separate from Harry's main story.
One common theme is redemption. Since Slytherin has a somewhat dark reputation, the descendants often have to prove that they are not evil. For example, they might fight against dark wizards to show that they are on the side of good. Another theme is identity. Discovering they are a Slytherin descendant makes them question who they are and how they should act.
I've also read 'Green and Red: A Slytherin - Gryffindor Love Story'. Here, Ginny is initially skeptical of Harry being in Slytherin. But as the story progresses, they discover they have more in common than they thought. The fanfic delves into their personal growth, their love for Quidditch which becomes a connection point, and how they overcome the house rivalries to be together.
I'm not sure of a specific title, but generally in such fanfics, the abuse Harry faces in Slytherin could be psychological, like being ostracized or bullied verbally. Some might explore how he tries to keep his Gryffindor values while dealing with this difficult situation in a house known for its more cunning nature.