One plot idea could be that Amelia, a new character in the wizarding underworld, teams up with Harry Potter to expose a dark magic ring operating there. They might face challenges like hidden traps and double - crossing allies.
In this fanfiction, Amelia could be a descendant of an ancient wizarding family with a connection to the underworld. Harry Potter is drawn into her world when he realizes that a threat in the underworld is linked to Voldemort's remaining followers. They embark on a journey where they must use their combined skills and knowledge of magic to defeat the new evil rising from the depths of the underworld.
One idea could be that Amelia is a new arrival in the Naruto universe's underworld. Maybe she has some unique powers that draw the attention of the various criminal elements, including some of Naruto's foes. Naruto, being the hero, gets involved to protect her and discovers there's more to her than meets the eye.
Another plot could involve Amelia Bones and Harry Potter teaming up to investigate a series of mysterious disappearances in the wizarding world. These disappearances could be linked to a new dark wizard or an old Death Eater faction trying to rise again. As they work together, Harry learns more about Bones' past and her family, and she in turn gets to see Harry's true potential as a leader and a fighter.
Perhaps a fanfiction where the Basilisk is not a solitary monster but part of a larger, more complex ecosystem in the Chamber of Secrets. There could be other magical creatures that depend on the Basilisk in some way, and when the Basilisk is in danger, these other creatures come to its aid. This would change the whole dynamic of how the characters interact with the Basilisk and the Chamber of Secrets.
One idea could be Amelia Bones mentoring Harry in the ways of the Ministry of Magic's inner workings. This would give Harry an edge in understanding the complex bureaucracy and politics that surrounds the wizarding world. Another plot could involve Amelia Bones investigating a dark magic mystery, and Harry getting involved accidentally, leading them to work together to solve it.
Maybe Harry and Amelia are from two different worlds. Harry is from a world of magic and Amelia from a non - magical world. They accidentally cross paths when a magical portal opens up. They then have to learn about each other's worlds and help each other out in various situations, such as Amelia helping Harry understand non - magical technology and Harry showing Amelia the wonders of magic.
One idea could be a crossover where Harry and Neville end up in the Naruto universe. They could learn chakra techniques and use their magic in new ways. For example, Harry might combine his Patronus charm with a chakra-based attack. Neville could use his knowledge of Herbology to discover new medicinal plants in the Naruto world.
One idea could be a crossover where Pietro uses his super speed to deliver important Hogwarts letters that the owls can't manage in time. Another could be that Pietro accidentally enters the wizarding world and has to learn magic while Harry helps him adapt. Maybe Pietro's sister Wanda also gets involved and her magic interacts in strange ways with the Hogwarts spells.
One plot idea could be that Urahara Kisuke somehow ends up in the Harry Potter universe. He might use his unique inventions and skills from the Bleach world to help Harry and his friends in their fight against Voldemort. For example, his kido skills could be translated into new spells in the wizarding world.
A plot could be about a student who has a phobia of large groups (agoraphobia). At Hogwarts, there are always big gatherings in the Great Hall, Quidditch matches, etc. This character could struggle to attend these events. Their friends could try to help them gradually face their fear, and in the process, they might discover a magical solution or just the power of friendship to overcome it.
Maybe Sirius in his puppy Animagus state gets caught by Filch. Filch tries to keep him as a new pet for Hogwarts, not realizing it's Sirius. Sirius then has to figure out a way to escape while also not revealing his true identity. This could lead to a series of hilarious events as Sirius tries to outwit Filch and his cat, Mrs. Norris.