A crossover could start with a portal opening between the two worlds. A group of students from Hogwarts, including Harry Potter himself, accidentally step through it and end up in The Last Kingdom. They are shocked by the primitive living conditions compared to their magical world. But they also notice that there are some hidden magical elements in this world that are different from what they know. They then decide to use their magic to improve the situation in The Last Kingdom, for example, by using spells to heal the sick or protect the villages from invaders. And in the process, they form alliances with the locals and have many adventures.
Definitely Harry Potter could be one of the main characters. He has the courage and magic skills to be a key figure in the crossover. Another could be Uhtred from The Last Kingdom. His warrior skills and knowledge of the land could pair well with Harry's magic. Hermione might also be a main character as she could use her intelligence to figure out how the two worlds interact.
Perhaps Voldemort discovers the power of the Heartless and tries to use them to his advantage. The protagonists from Kingdom Hearts then have to work with the Order of the Phoenix to stop Voldemort and the Heartless. The Hogwarts students could be fascinated by the Keyblades and the different worlds the Keyblade wielders have been to, and there could be a lot of cultural exchange between the two groups.
Yes, there are quite a few out there. Some fanfictions might explore how the characters from Kingdom Hearts would interact with those from Harry Potter. For example, Sora could end up at Hogwarts and have to deal with the magic there while also trying to find his friends. It's a really cool concept that combines the unique magic systems of both universes.
Well, I've come across some interesting ones. Some fanfics blend the magic systems really well. For example, they might have Harry learning about the power of the Keyblade while still using his wizardry skills. However, the quality can vary a lot. It's important to read reviews or summaries first to find the ones that suit your taste. You could also check out fanfiction forums where people discuss and recommend their favorite crossovers between these two universes.
One possible plot could be that Harry, after defeating Voldemort, decides to create a kingdom where magic and non - magic folk can live together in harmony. He uses his knowledge of magic and the respect he has gained to build a new society with its own set of laws and governance that are fair to all. For example, he could create schools that teach both magic and Muggle subjects to promote understanding between the two worlds.
In this fanfiction, Harry Potter might face challenges from the existing power structures in the kingdom. However, he would use his Gryffindor courage and the support of his friends. He could reform the kingdom's laws to be more just, as he has seen the importance of equality at Hogwarts. He might also establish a magical academy in the kingdom similar to Hogwarts to train the young generation, which would help to integrate magic into the kingdom's daily life and make it more prosperous.
Well, in this fanfiction, Harry might build a kingdom in a hidden location, perhaps an uncharted island. He would have to use powerful spells and his knowledge of magic to construct buildings, set up defenses, and form a government. He could also invite his friends like Hermione and Ron to help him, and together they would make laws that are fairer than those in the wizarding world we know from the original books.
In a Harry Potter and Superman crossover fanfiction, perhaps Voldemort discovers Superman's existence and tries to use his powers for his own evil deeds. He might try to control Superman's mind. But Superman, being the strong - willed hero he is, resists. Harry and his friends then team up with Superman to fight Voldemort. They learn a lot from each other. Harry learns about physical strength beyond magic, and Superman gets to understand the complexity of magic.
Well, it could be that Supergirl lands in the wizarding world somehow. Maybe she's chasing a bad guy who uses magic to escape to Hogwarts. And then she teams up with Harry Potter to fight the bad guy. Harry could teach her about magic while she teaches him about her superpowers.
One possible plot could be that Moana's island is threatened by dark magic from the Harry Potter universe. Harry, Hermione, and Ron could be transported to Moana's world while on a mission to stop the spread of this dark magic. They would team up with Moana to use her knowledge of the ocean and the island's magic, along with their own wizarding skills, to fight off the dark forces. Maybe they'd have to face off against a wizard who has enchanted some of the sea monsters in Moana's world.