One interesting Goyle fanfiction could be one where he has a change of heart and tries to break away from his family's dark views. It might explore his internal struggle between loyalty to his pure - blood family and his own sense of right and wrong.
A great Goyle fanfiction might be set in an alternate universe where he is sorted into Hufflepuff instead. This would completely change his trajectory. He could become a much more friendly and inclusive character, befriending students from all houses. It would show how the sorting hat's decision can have a profound impact on a character's development.
One interesting fanfiction could be about Crabbe and Goyle having a change of heart and turning against the Dark Arts. Maybe they realize the harm Voldemort is causing and decide to help Harry secretly. Another could focus on their friendship before they got involved with the wrong crowd at Hogwarts, showing a more innocent side of them.
Often, the best authors of Goyle fanfiction are the ones who take a relatively minor character like Goyle and give him depth. They might create backstories for him that explain his behavior in the original books. Maybe they show that he's not just a sidekick to Malfoy but has his own hopes, dreams, and fears. These authors usually do a great job of fleshing out his character and making him more than what he seemed in the main series.
One interesting Harry Potter 1945 fanfiction could be about the early days of Hogwarts and how the magical world was different back then. Maybe it focuses on the founding of certain magical traditions that we see in the main series but are not fully explored. For example, it could detail how the houses were originally established and what the selection criteria were like in 1945.
In some fanfictions, Smart Potter is not just book - smart but also socially smart. He uses his intelligence to understand the political undercurrents in the wizarding world. He might form alliances with different houses and magical creatures to bring about a more inclusive and harmonious wizarding society, all while still being a student at Hogwarts and dealing with his regular classes.
One interesting fanfiction could be 'Ginny's Hidden Adventures'. In this, Ginny might go on a secret quest while Harry is away on Auror business. It could show her as a strong and independent witch, using her skills to solve mysteries in the wizarding world.
One interesting 'Harry Potter Lord Potter' fanfiction could be the ones where Harry discovers his true heritage as 'Lord Potter' much earlier and starts to reshape the wizarding world's politics. It often involves him being more assertive and using his family's ancient powers and influence.
I'm not sure about the absolute best, but there are some authors who have a good reputation. Some of the ones who are often recommended might be those who really dig deep into the characters of Crabbe and Goyle. They don't just write them as the typical bullies but give them more complex personalities.
One interesting Harry Potter ritual fanfiction could be those that explore the magical rituals within Hogwarts in a new way. For example, a fanfic might focus on an ancient protection ritual that the founders of Hogwarts once used. It could add new layers to the story by showing how the characters discover and deal with the power and significance of such a ritual.
There are Denarian Harry Potter fanfictions that focus on character development. In some, Hermione might be the one to first encounter Denarian magic and then share her knowledge with Harry and Ron. This could lead to a whole new adventure as they explore the uncharted territories of this different magical system. It could also show how the trio's friendship is tested and strengthened through this new discovery.
One interesting 'Harry Potter blindness' fanfiction could be about how a blind character experiences Hogwarts in a completely different way. They might rely more on their other senses like hearing the magical creatures in the Forbidden Forest or feeling the magic in the air. Another could focus on a blind wizard who develops unique spells that don't require sight for casting.