Another theme could be delving deeper into the backstories of minor characters. Like exploring the life of Neville Longbottom's parents before they were attacked. This can give more depth to the overall story and 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.
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 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.
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.
One of the common themes is time - travel in the 'Harry Potter' universe. Writers might create stories where a character goes back in time to change an event in the wizarding history. Another popular theme is the introduction of new magical creatures that the main characters have to interact with. Additionally, there are fanfictions that explore the family histories of the characters, like the Black family tree and the secrets it holds, all while maintaining a family - friendly and positive tone.
Friendship is a very common theme. For example, exploring the deepening of the friendship between Harry, Ron and Hermione during their adventures at Hogwarts.
The theme of female characters taking on new roles in the wizarding society is quite popular. For example, a fanfiction could explore what it would be like if a female character became a professor at Hogwarts at a young age. Also, stories about female characters' adventures outside of Hogwarts, perhaps on a secret magical quest, are well - liked.
A theme centered around the development of friendships among different houses in Hogwarts is also very suitable. Such as a story where students from Gryffindor, Hufflepuff, Ravenclaw, and Slytherin come together to solve a mystery that affects the whole school. This can show the unity and diversity within the Hogwarts community, which is an important aspect of the 'Harry Potter' world.
One appropriate theme could be the further adventures of the characters after the main series ends. For example, exploring how Harry, Ron, and Hermione continue to fight dark magic in the wizarding world. Another could be the backstories of minor characters, like Neville's family history or Luna's early life at Hogwarts.
Another great theme is creating new adventures for the characters in different magical locations. Maybe the trio - Harry, Ron, and Hermione - go on an adventure in a far - off magical land that J.K. Rowling hasn't written about yet. This allows fans to expand on the sense of exploration in the series.
The Triwizard Tournament is also an exciting and appropriate story arc. Harry's unexpected entry into the tournament and how he overcomes the various challenges set before him. It includes elements of magic, mystery, and the building of relationships with students from other schools, like Cedric Diggory.