What are some interesting ideas for a Harry Potter and Kingdom Hearts fanfiction?

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.

Perhaps Fem Harry Potter is mistaken for a Keyblade wielder at first. She has to prove herself in the Kingdom Hearts universe while also trying to find a way back to her own world. Along the way, she discovers that there are similarities between the magic in her world and the power of the Keyblades.

One idea could be a crossover where characters from both universes meet in a magical realm. For example, Harry Potter characters could find themselves in the world of Pandora Hearts and have to deal with the strange creatures and the complex power dynamics there. Another idea is a story where the magic systems of both worlds combine in unexpected ways. Maybe a Hogwarts student discovers a Pandora Hearts - style power within themselves.

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.

Another interesting concept is an OC who is a member of an organization that opposes Organization XIII in a different way. Maybe they use magic that is not based on darkness or light, but something in between, which causes them to be shunned by both sides at first.

One idea could be exploring the backstories of the new characters introduced in Kingdom Hearts 3 in more depth. For example, you could write about how they came to be in the different worlds and what their true motives are.

One idea could be a fanfiction where the characters from Kingdom Hearts watch their own adventures from an alternate universe. It would be really cool to see their reactions to different versions of themselves and the events that unfold.

One idea could be a crossover where Sora and his friends from Kingdom Hearts end up in the Pokemon world. They could team up with trainers to battle against the Heartless that have somehow invaded the Pokemon realm. Another idea is that some Pokemon could have the power of Keyblades, and they use it to protect their regions from both Pokemon villains and the threats from Kingdom Hearts like Organization XIII. Maybe a Pokemon like Pikachu could befriend Sora and they go on an adventure together to find a way to get Sora back to his own world while also helping the Pokemon world.

One idea could be a story where the Pokemon trainers are transported to the Kingdom Hearts universe and have to team up with Sora and his friends to fight against the Heartless. They could use their Pokemon's unique abilities in combination with keyblades to defeat the enemies.

One idea could be to focus on building a kingdom centered around Hogwarts. Expand the grounds, add new magical creatures' habitats, and create a more self - sufficient community within the school's vicinity. For example, students could be involved in growing magical plants not just for potions but also for food and trade.