The combination of different power systems. Naruto has his chakra and various jutsu, while Kingdom Hearts has magic and keyblades. Seeing how these interact, like Naruto using his Rasengan with the help of Kingdom Hearts' magic, is really exciting.
The new settings that are created. When Naruto enters the Kingdom Hearts worlds or vice versa, we get to see familiar places from both franchises in a new light. For instance, if Naruto ends up in Traverse Town, how would he adapt to this strange new place filled with different species and the ever - present threat of Heartless? It adds a whole new layer of adventure and exploration to the story.
One key element is how Naruto's godlike powers are translated into the Kingdom Hearts setting. For example, his Rasengan could be reimagined as a powerful attack against the Heartless.
Another interesting pairing could be Sakura and Kairi. Sakura is a strong - willed kunoichi who has grown from being a bit of a fangirl to a capable fighter. Kairi is also a strong - hearted girl. They could bond over their experiences of being in the background sometimes but still being important to their respective groups. They might even learn some new self - defense moves from each other.
One popular theme is the clash of different power systems. For example, how Sonic's super forms compare to the power of the Keyblade. Another is the exploration of different worlds. Authors like to put Sonic characters into the unique and often beautiful or dangerous worlds of Kingdom Hearts.
One interesting storyline could be Sora and the gang from Kingdom Hearts getting lost in the world of DuckTales. They could team up with Scrooge McDuck to search for a special keyblade that's hidden in one of Scrooge's many treasures. This would bring together the magic of Kingdom Hearts and the adventure - seeking nature of DuckTales.
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.
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.
Well, a really exciting plot might involve characters from different worlds within the Kingdom Hearts universe who were previously thought to be lost or dead suddenly reappearing during the Keyblade War. They could bring with them new powers or knowledge that shakes up the whole conflict. For example, if a character from a long - forgotten world shows up with the ability to nullify certain Keyblade attacks, it would completely change the dynamics of the battles. There could be a race among the warring factions to either recruit this character or eliminate them. And as the story unfolds, we could see how the different Keyblade wielders' loyalties are tested in the face of this new threat or opportunity.
One of the most interesting storylines could be Riku crossing over into another Disney - inspired world where he has to team up with unexpected characters. For example, he might end up in the world of 'Alice in Wonderland' and have to navigate the strange rules and characters there while still maintaining his connection to the Kingdom Hearts universe. It would be a really cool blend of the familiar Kingdom Hearts elements with the wacky world of Wonderland.
One interesting plot twist could be the Keyblade wielders finding themselves in the world of Remnant. They might initially be confused by the Grimm and the Huntsmen system. For example, Sora could mistake a Grimm for a Heartless at first, but then realize it's a whole different kind of threat. Another could be Ruby and her team getting access to the power of the Keyblade. Ruby's scythe skills combined with Keyblade magic would make for an incredibly powerful combination. And perhaps a plot twist where the villains from both universes team up. Salem could see the power of the Heartless and use them to her advantage, while Xehanort might be interested in the power of the Maidens in RWBY.
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.