Maybe the actors are invited to a special event in Hogwarts. They interact with the students and teachers. The actors could introduce modern Muggle things like smartphones or movies to the wizarding world, which would create a lot of confusion and amusement. Hermione would probably be very interested in learning about these new things and might even try to figure out how to incorporate some of their functions into magic.
Another plot could be that the actors are turned into characters from the Harry Potter series through a powerful spell gone wrong. They then have to live as those characters and face the challenges. For instance, Rupert Grint as Ron Weasley would have to deal with his fear of spiders in a more real - life way than just acting it out. This would be a great opportunity for some comical and also heart - warming moments as they adapt to their new identities.
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.
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 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.
One idea could be that Harry discovers Narcissa has a secret mission to undermine Voldemort from within. Maybe she's been secretly helping the Order of the Phoenix all along and Harry stumbles upon this knowledge.
In a 'Harry Potter meets Tom Riddle' fanfiction, a really unique plot could be that Tom Riddle is reborn as a normal wizard without the dark desires due to some powerful magic. Harry Potter meets this new Tom and they become friends at Hogwarts. However, there are still some remnants of the old Tom's power that attract dark forces. So, Harry and Tom have to work together to fend off these threats while also exploring Tom's new identity and how it affects the future of the wizarding world. This would involve a lot of character development for both Harry and Tom, as they navigate their relationship in this new scenario.
A plot could revolve around a magical artifact that has been stolen from Hogwarts. Harry and Pansy are the prime suspects in each other's eyes. But as they start to investigate, they realize they are being framed. They then team up to find the real thief. Along the way, they discover that they have more in common than they thought, like their love for Hogwarts in their own ways. As they search through the dark corners of the castle and the Forbidden Forest, their relationship evolves from animosity to respect.
In a 'Harry Potter meets Sirius Black fanfiction', it could be interesting if Sirius and Harry found a way to time - travel. They could go back to the time when James and Lily were alive. This would not only allow Harry to meet his parents but also give Sirius a chance to change some events that led to his downfall. They might also interfere with the actions of Voldemort in the past, creating a whole new timeline and a different future for the wizarding 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 idea could be that the Exorcists from D Gray - Man end up in the wizarding world of Harry Potter. They might team up with the Order of the Phoenix to fight against a new threat that combines the dark magic of the Death Eaters and the Akuma from D Gray - Man.
In this fanfiction, it could be that Hela is in need of something that only Harry can provide. Maybe a magical item from his world that has the power to heal a wound she got in a previous fight. Their meeting then becomes a journey of discovery and cooperation as Harry tries to find the item and Hela protects him during the search.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.