You could write a fanfic about a group of Hogwarts students who accidentally time - travel back to the era when the founders of Hogwarts were alive. They get to experience the early days of the school, learn about the original intentions of the founders, and maybe even play a role in some important events that shaped Hogwarts as we know it. It would be really exciting to see how they interact with the founders and the different magical practices of that time.
One idea could be to create a story where a new student arrives at Hogwarts with a unique and powerful form of magic that no one has seen before. This could lead to all sorts of adventures and challenges as they try to fit in while also dealing with those who might be jealous or afraid of their power.
One idea could be to explore the lives of minor characters in the Harry Potter universe. For example, you could write about the backstory of Neville Longbottom's parents before they were tortured into insanity. Another idea is to create a new magical creature and describe its interaction with the known wizarding world. Maybe a creature that lives in the Forbidden Forest and has a special connection to the trees there.
One idea could be exploring the inner workings of the Ministry from the perspective of a new, young employee. They could discover some dark secrets hidden within the various departments.
You could also focus on the Weasley - Potter family relations in a fanfic. For instance, how the two families' magic combined in different ways. Maybe there are some spells that only work when a Potter and a Weasley work together, and exploring those spells and the situations where they are used can make for a great fanfic story.
One idea is that Harry discovers a magical realm that is fueled by pure love for magic. Only those with a true passion for magic can enter. Inside, he meets magical creatures that teach him forgotten spells. Another idea could be Harry teaching younger students about his love for magic through stories of his adventures. He could inspire them to look at magic in a different way, not just as a tool but as a beautiful art form.
Well, a really interesting fanfic idea could be that a character creates a spell that combines different curses and spells together in a unique way. For example, a spell that has the power of the Confundus Charm and the speed of the Levitation Charm. Also, a fanfic about a curse that spreads like a virus among the wizarding community and how they come together to find a cure would be very engaging.
One interesting concept could be alternative timelines. For example, what if Harry had been sorted into Slytherin instead of Gryffindor? It would completely change his relationships and the story's progression. Another concept might be the exploration of different magical creatures that were only briefly mentioned in the original books. Fanfiction often delves deeper into their behaviors and habitats. Also, some fanfictions focus on the backstories of minor characters, like Neville Longbottom's family history before he came to Hogwarts.
One interesting idea could be a fanfic that focuses on the Marauders' time at Hogwarts. It could explore their pranks, friendships, and how they came to be the legends that we hear about in the original books. For example, showing how they created the Marauder's Map in more detail.
One interesting idea could be a fanfic where the Marauders attend Hogwarts during modern times. They'd have to deal with things like smartphones and social media while still maintaining their mischievous ways. Another could be a story that focuses on the lives of the house - elves after the events of the books, perhaps exploring their newfound freedom. And a third idea could be a fanfic about a new dark wizard emerging in the wizarding world years after Voldemort's defeat, and how the new generation of Hogwarts students respond.
A great 'Harry Potter fanfic' idea might be a story that delves deeper into the relationship between Snape and Lily. Maybe a fanfic where Snape has a chance to change the past and save Lily in a different way. Another idea is to write a fanfic about the ghosts in Hogwarts and their backstories, like how they died and why they chose to stay at the school. Additionally, a story where the Weasley twins open a magical joke shop in a different country and the challenges they face there would be really interesting.
One interesting idea could be exploring the lives of the minor characters more in - depth. For example, what was Neville Longbottom's life like during the summers at home? Another idea is to create an alternate ending to the series. Maybe Voldemort could have been redeemed instead of defeated. Also, a fanfic could focus on the magical creatures and their own society within the wizarding world.