What are some interesting ideas for a Pokemon Kingdom Hearts fanfiction?

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 that Tangela gets transported into the Kingdom Hearts universe and has to team up with Sora to find a way back to its own world. Along the way, Tangela discovers new powers that are a combination of its Pokemon abilities and the magic in the Kingdom Hearts world.

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.

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 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 that the Heartless somehow find their way into the Marvel universe and start attacking various locations. The Avengers, being the protectors, team up with Sora and his friends from Kingdom Hearts. They initially have some clashes due to different fighting styles and ways of understanding the world, but eventually learn from each other and combine their powers to defeat the Heartless. For example, Iron Man could use his technology to analyze the Heartless' weaknesses, while Sora uses his Keyblade to directly combat them.

One idea could be to explore what would happen if Sora and his friends got trapped in Ariel's underwater world during a Heartless attack. They'd have to team up with Ariel and her friends to fight off the Heartless while also dealing with Ursula's schemes in a new way.

Well, some might explore unique character relationships that deviate from the original game's relationships. For example, it could create new storylines where the 'futa' characters interact with male characters in ways that add depth to their personalities and the overall plot.

Well, a great plot for a Kingdom Hearts 3 Aftermath fanfiction could involve the relationships between the different characters. Like, how Riku and Kairi's friendship might have evolved. Also, since Xehanort was defeated, there could be a power vacuum. Some villains might try to take advantage of it, and the heroes have to stop them before a new, greater evil rises. It could also show the daily lives of the characters in a more peaceful time, with little hints of the past adventures.

You could write a fanfiction where Peter Pan decides to leave Neverland and join Sora on his journey through the different worlds in Kingdom Hearts. This would bring a whole new dynamic to the group. Peter's carefree and adventurous nature might clash with some of the more serious characters, but at the same time, his skills and knowledge of magic could be a great asset. He could also introduce Sora and the others to new areas in Neverland that they haven't explored yet, which might hold secrets related to the Heartless or the overall plot of Kingdom Hearts.