Often, the main protagonists from the original kingdoms tend to be popular. For example, if there are heroic characters known for their bravery in their respective kingdoms, they will likely be central in the crossover fanfiction as well.
Well, one interesting concept could be the unexpected character interactions. For example, characters from different kingdoms might have to work together in a way that defies their normal allegiances in the original stories. This can lead to unique storylines.
One interesting concept could be the merging of different kingdoms' cultures. For example, a high - fantasy kingdom with knights and magic crosses over with a more oriental - inspired kingdom. This can lead to unique interactions between characters, like a western knight learning the ways of the eastern martial arts. Another concept is the power dynamics. When two kingdoms cross over, the different power structures, be it magical or political, can create a lot of drama and conflict. And also the idea of different species from each kingdom interacting, such as elves from one kingdom and dwarves from another.
First, you need to decide which kingdoms to cross over. Research their characteristics, like their cultures, political systems, and magic if they have any. Then, create your main characters. They could be from one kingdom, or be hybrids of both. Outline the basic plot, whether it's a quest, a war, or a mystery. For example, if it's a war, figure out what the cause is, like a resource from one kingdom that the other wants. After that, start writing the first chapter, introducing the setting and the main characters.
Character interaction is a key element. Axel interacting with characters from different universes can lead to interesting dynamics. For example, his fiery personality might clash or blend well with more reserved characters.
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.
One possible plot could be that Sora and his friends land in the underwater world of The Little Mermaid. Ariel could be in trouble, perhaps captured by the Heartless. Sora, with his Keyblade, would fight to free her. Donald and Goofy could help by using their magic and strength respectively. They would then have to find a way to restore the underwater kingdom's heart which has been affected by the Heartless presence.
One possible plot could be that Naruto and his friends are somehow transported into the Kingdom Hearts universe. Naruto, with his never - give - up attitude, could team up with Sora to fight against the Heartless. They might learn new techniques from each other. Naruto could teach Sora some of his ninja skills like shadow clone jutsu, and Sora could show Naruto how to use the Keyblade more effectively in combat.
One possible plot could be that Sora from Kingdom Hearts accidentally ends up in the Bleach universe. He teams up with Ichigo to fight against a new threat that is causing chaos in both their worlds. They have to combine their unique powers, like Sora's Keyblade skills and Ichigo's Soul Reaper abilities, to defeat the enemy.
One creative plot could be the characters from Kingdom Hearts finding themselves in the Resident Evil world. Sora, Donald, and Goofy might have to use their Keyblades against the zombies and bio - organic threats. They could team up with some of the Resident Evil protagonists like Leon or Jill to find a way back to their own world while also trying to stop a major outbreak.