A great concept for this fanfic could be that the actors are on a movie set, but instead of filming, they accidentally step through a magical portal that leads them to a different time in the wizarding world. For example, they end up during the time of the Marauders. They might be mistaken for strange wizards at first. The actors would then have to navigate this new world, using their knowledge of the 'Harry Potter' story to their advantage. They could also introduce some Muggle technology to the wizards, like showing Sirius Black how a mobile phone works. This would create a lot of comical and interesting situations.
Well, perhaps in the fanfic, the 'Harry Potter' actors are cursed to forget their real identities and believe they are the characters they played. So, Rupert Grint would think he is Ron Weasley and start causing all sorts of chaos in the Muggle world as he tries to find his way back to Hogwarts. Or, the actors could be invited to a special event at Hogwarts and end up having to perform a play about the events of the wizarding war, which could lead to some really interesting interactions with the characters who lived through it.
One idea could be that the actors from the Harry Potter movies get magically transported into the wizarding world of Harry Potter. They could use their knowledge of the story to help the characters, or they could be completely bewildered and cause chaos. For example, Daniel Radcliffe could end up having to explain to Harry Potter himself how his story is told in the Muggle world.
A possible plot could involve a Dragonborn who discovers a hidden portal to the wizarding world. In the wizarding world, they learn about magic wands and spells. The Dragonborn could then combine their Thu'um powers with magic spells to fight against dark forces that are threatening both worlds. For example, Voldemort could team up with Alduin in some way, and the Dragonborn and Harry Potter have to work together to stop them.
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.
One idea could be that Harry Potter and his friends accidentally get transported to the RWBY world. They could then use their magic in unique ways to help the RWBY characters fight Grimm. For example, Hermione could use her knowledge of spells to create new defenses against the Grimm that the RWBY characters haven't thought of before.
Make the actors have special powers related to their on - screen characters. For example, Emma Watson's character could have Hermione - like intelligence but also be able to use it in a new way, like creating spells that no one has ever thought of before. This would make the story stand out.
One idea could be a crossover where Merlin uses his magic to help Harry in a difficult situation at Hogwarts, like when he's facing a powerful dark wizard. Merlin's ancient magic might be different from what's taught at Hogwarts and could offer a new perspective on solving problems.
You could write a fanfic centered around a Niffler that gets into all sorts of mischief in Hogwarts. It steals valuable magical items from students and teachers, and a group of friends has to track it down before it causes too much chaos. Or perhaps a story about a magical creature that is a hybrid of a Phoenix and a Thestral. This unique creature has the ability to see the dead like a Thestral and the rebirth powers of a Phoenix.