One plot idea could be that the Ten Tails' power somehow seeps into the wizarding world. Harry Potter and his friends might have to figure out how to stop the chaos it causes. For example, its chakra could disrupt magic spells or create strange magical anomalies.
Another idea is that the Ten Tails' presence starts to change the very fabric of Hogwarts. Rooms start to shift and transform due to its power. Harry, Hermione, and Ron must navigate this new, dangerous Hogwarts while also finding a way to send the Ten Tails back to its own realm.
Maybe Harry discovers he has a connection to the Ten Tails and has to learn to control its power while still dealing with Voldemort.
A great plot could be about a group of young ninjas who accidentally awaken the Ten Tails and then have to find a way to reseal it before it destroys everything. They could discover new jutsus and powers along the way. Also, what if the Ten Tails had a different form that was not known before, and the characters have to figure out how to deal with it.
Another cool plot twist could be that the Ten Tails has the ability to split into multiple smaller entities, each with its own unique power. This would force Naruto and his friends to come up with new strategies to deal with these new threats. And it might also lead to some of these smaller entities turning good and helping Naruto in unexpected ways.
Well, Harry could use his magic to try and communicate with the Ten Tails. Since he has a connection to the magical world, he might be able to find a way to reach the Ten Tails' consciousness. Hermione, on the other hand, would probably study ancient magic texts to figure out more about it.
One idea could be that the scarecrow comes to life and becomes a magical creature that helps Harry Potter in a dangerous task. Maybe it has the ability to sense dark magic and warns Harry of approaching threats.
Perhaps Orochi is a hidden figure in the history of the wizarding world that has been forgotten. Harry discovers some old texts in the Hogwarts library that mention Orochi in relation to a long - lost magical artifact. This leads him and his friends on a quest to find the artifact before it falls into the wrong hands, as it has the power to either control Orochi or be used by Orochi to gain ultimate power over the wizarding world.
One plot idea could be that Harry and Angelina team up for a special Quidditch training session for the younger students. They discover a new flying technique together that gives Gryffindor an edge in future matches. Another could be that they go on a secret mission within Hogwarts to uncover a hidden artifact that has been causing strange magical disturbances. And a third idea is that Angelina gets injured during a match and Harry uses some of his unique magical skills, learned from his various adventures, to help her recover faster than normal.
One idea could be a story where a character has a special power to resist Dementors' effects more than others. Maybe they discover a hidden spell or have a unique magical ability that they use to fight off Dementors when others are in danger. For example, a young witch or wizard who can emit a positive energy that counteracts the Dementors' despair.
One idea could be Norberta getting lost in the Forbidden Forest and Harry has to find her. Another could be Norberta growing ill and Harry, with his knowledge of magical creatures, tries to heal her. Maybe Norberta could get into trouble with some other magical creatures and Harry has to step in to protect her.
Maybe in the fanfiction, the three - tailed beast crosses over into a modern - day human world. People initially fear it, but then they discover that it has a gentle side and is actually trying to find its way back home. It could form a bond with a group of humans who help it on its journey, leading to many adventures along the way.