Well, 'A Darker Shade of Magic in Harry Potter' is a good one. It presents a world where magic has a more sinister side and Harry has to navigate through it. Then there's 'Harry Potter: The Darkened Path' which changes the story by making Harry face much harsher challenges and moral dilemmas. 'The Darker Realm of Harry Potter' is also interesting as it shows how the wizarding world could be a much darker place with different power dynamics.
One great Harry Potter fanfiction is 'The Life and Times' by Jewels5. It delves deep into Lily Potter's life at Hogwarts and her relationship with Severus Snape. It offers a new perspective on the events that led to the Potter family's fate. Another good one is 'Manacled' which has a very interesting take on the post - war wizarding world and Hermione's journey in it. There's also 'After the Battle' which focuses on how the characters heal and move forward after the final battle against Voldemort.
There are fanfictions where the bond between Harry and Lily is explored through time - travel scenarios. In these stories, Harry might get to meet Lily in her own time and they could form a special connection that helps him understand his family history better. This can lead to some really interesting character development for Harry as he gets to know his mother in a more personal way.
One great fanfiction could be 'Lily's Legacy'. In this story, it explores the bond between Lily and Harry in a really heart - warming way. It might show how Lily's love continues to protect Harry even in different magical situations. Another is 'Harry and Lily's Unseen Moments' which delves into some of the imagined interactions they could have had if Lily had survived. It gives a sense of a mother - son relationship that was cut short in the original series.
I also recommend 'Harry and Fleur: An Unlikely Alliance'. This fanfic starts with a rather forced alliance between them due to some unforeseen circumstances in Hogwarts. As they work together, they discover new sides of each other. It's a long - form fanfiction that really takes its time to build up their relationship.
I've heard of a paraselenic Harry Potter fanfiction that focuses on the Forbidden Forest. The paraselenic influence makes the forest even more mysterious. There are strange lights and new, moon - related magical beings. Harry and his friends have to navigate through this new and dangerous version of the forest, which makes for a really exciting read.
One great 'Ascension' Harry Potter fanfiction could be 'The Ascension of Harry Potter: A New Path'. It often features Harry developing unique powers and taking on a more powerful role in the wizarding world. Another might be 'Ascension's Call' where Harry is guided by an ancient magic towards a greater destiny. There are also some that focus on Harry's ascension in terms of his social standing within Hogwarts, like 'Ascension Among Peers' which shows him rising above the petty rivalries and becoming a true leader.
One good Harry Sirius Potter fanfiction is 'The Bond Beyond Blood'. It explores the unique relationship between Harry and Sirius in a very heart - warming way. It shows how Sirius could have been more involved in Harry's life at Hogwarts if not for certain circumstances.
One popular 'Harry Potter is a redhead' fanfiction might be 'The Red - Haired Harry'. It could explore how his appearance change affects his relationships at Hogwarts. Maybe his friends like Ron and Hermione would react differently at first sight. Another could be 'Red - Headed Potter's Adventures' which might take him on different quests where his new look gives him a unique identity among the wizarding community.
Well, there's 'Snape's Hidden Guidance'. In this fanfiction, Snape secretly mentors Harry in ways that Dumbledore never could. It gives a whole new perspective on their relationship. Then there's 'Harry and Snape: An Unlikely Alliance' where they are forced to work together against a new dark threat, and in the process, they begin to see each other in a new light. 'The Unspoken Understanding' is also a good read. It's about how Snape and Harry develop an unspoken bond that helps them both through difficult times.
One type of interesting fanfiction could be those that expand on the backstories of minor characters. For instance, Neville Longbottom's journey to becoming a more confident and powerful wizard can be explored in great detail, showing his training and the challenges he overcame outside of what was shown in the original books.