One positive theme could be exploring the further adventures of the characters after the events of the books. For example, how Harry, Hermione, and Ron continue to fight against the remaining dark forces in the wizarding world. Another theme could be the development of friendships between different houses at Hogwarts, like a Slytherin and a Gryffindor becoming friends and working together.
Appropriate themes include exploring the backstories of minor characters. For instance, Neville's family history and how it influenced his character. Also, fanfiction can focus on the magical creatures in the wizarding world and how the main characters interact with them. It could be about Harry and Hermione's efforts to protect a rare magical creature from being hunted. And exploring the magical education system further, like creating new spells or classes at Hogwarts.
Positive themes can be centered around the rebuilding of the wizarding world post - Voldemort. How the characters contribute to the restoration of the damaged parts of the wizarding society, both in terms of infrastructure and the social fabric. Another great theme is the exploration of the international wizarding community. For example, Hermione's experience when she travels to other wizarding schools around the world to study different magical cultures and bring back new knowledge to Hogwarts.
One appropriate theme is to rewrite certain parts of the story from a different character's perspective. For instance, seeing the events of the Triwizard Tournament from Cedric Diggory's point of view. Or exploring how the wizarding world copes with the aftermath of the Battle of Hogwarts in different regions that were not covered in the original books.
One appropriate theme could be exploring the post - Hogwarts lives of the characters. For example, how they use their magic in the Muggle world or how they contribute to the wizarding society in new ways.
One appropriate theme could be exploring the further adventures of the characters after the main story ends. For example, how Harry, Ron, and Hermione continue to fight dark magic in new forms that emerge in the wizarding world.
One positive theme is friendship. Fanfictions often explore the deep bonds between Harry, Ron, and Hermione in new and interesting ways. Another is courage, showing how the characters face their fears just like in the original books. For example, Harry might have to stand up to a new dark force in a fan - created scenario.
Some great appropriate fanfiction themes in the 'Harry Potter' universe include exploring the backstories of minor characters. For example, we could learn more about the lives of the house - elves like Dobby or Kreacher before they came into contact with the main characters. Another theme could be new magical creatures that are discovered in the Forbidden Forest or other areas of the wizarding world.
One appropriate theme is exploring the friendships further. For example, fanfiction about Harry, Ron, and Hermione's adventures outside of the main events in the books. It could be them traveling during the summer holidays and having different magical experiences.
The theme of redemption is also common. It might involve a character who has made mistakes in the past getting a chance to make amends. For instance, a former Death Eater's journey towards redemption, which can show the power of forgiveness and change in the 'Harry Potter' universe.
Redemption is a great theme. For example, Draco could be on a journey to redeem himself for his past actions, and Harry could play a role in either helping or being skeptical of his efforts. It would add depth to their characters and explore the idea that people can change for the better.
One popular theme is friendship. Just like in the original books, fanfictions often expand on the strong bonds between Harry, Ron, and Hermione. For example, they might write about how the three friends support each other through difficult exams or face new challenges together outside of the main plot of the books. Another theme is the exploration of different magical cultures within the wizarding world. This could involve stories about characters visiting foreign wizarding schools or learning about unique magical traditions.
Some great 'Harry Potter' fanfiction themes include exploring the backstories of minor characters. For example, delving into the life of Luna Lovegood before she came to Hogwarts. What was her family like? How did she develop her unique personality? Another theme could be alternative timelines. What if Harry had been sorted into Slytherin? How would his story and relationships change? There are also themes about the post - war wizarding world. How do the characters rebuild and what new challenges do they face in a world recovering from the battle against Voldemort.