Another interesting one could be 'Harry Potter and Count D: The Forbidden Alliance'. In this story, Harry somehow forms an unexpected alliance with Count D. They might be brought together by a common threat that neither the wizarding world nor Count D's world has faced before. Their combined skills and knowledge from two very different magical backgrounds are used to fight against this new danger.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including those that combine 'Harry Potter' and 'Count D'. Just use the search function and type in relevant keywords like 'Harry Potter Count D' to find the ones that interest you.
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.
One could be 'The Sickly Days at Hogwarts'. In this fanfiction, Harry is sick with a mysterious magical illness that affects his magic. The story focuses on how his friends Hermione and Ron try to find a cure while also dealing with the fear that Harry might not recover. Another is 'When Harry Potter Took Ill'. Here, the story shows how the whole Hogwarts community reacts to Harry being sick, from the teachers trying to figure out what's wrong to the other students showing their concern.
One great Goldstein fanfiction could be 'The Goldstein Chronicles'. It delves into the character's backstory, exploring their family history within the wizarding world. Another is 'Goldstein's Adventure in Hogwarts', which focuses on their experiences at Hogwarts, making new friends and facing challenges. And 'Goldstein and the Mystery of the Forbidden Forest' is also interesting, where they get involved in solving a mystery deep in the forest.
One great 'emancipated Harry Potter' fanfiction could be 'The Emancipated Heir'. In this story, Harry breaks free from the constraints of the Dursleys early on and starts to explore his magic in a more self - directed way. He meets new characters who help him understand his true potential outside the traditional Hogwarts curriculum.
One great Harry Potter Aayla fanfiction could be 'Aayla's Adventure at Hogwarts'. It might tell a story about Aayla, a new character perhaps, who discovers she has magical abilities and starts her journey at Hogwarts. She could make new friends, face challenges in classes like Potions and Transfiguration, and have her own encounters with the Dark Arts.
There could be a fanfiction where Harry Potter, having the qualities of Quicksilver, uses his speed not just in combat or spell - casting but also in exploring the hidden secrets of Hogwarts. He might be able to zip through the secret passages and corridors so fast that he discovers things that no one else has. His quicksilver - like nature could also make him a bit of an enigma to his friends and foes alike, as they struggle to keep up with his pace both physically and mentally.