Another option is a crossover with the Star Wars universe. The keyblade wielder could find themselves on a planet like Tatooine. They might get involved in the conflict between the Jedi and the Sith. The keyblade's abilities could be compared to the lightsaber, but with its own distinct features. For example, it could have the power to unlock ancient Jedi or Sith secrets.
One idea could be to have the keyblade wielder from the original Keyblade world end up in a high - fantasy world like Middle - earth. The keyblade could be seen as a powerful and mysterious weapon, and the wielder might have to team up with characters like Aragorn to fight against Sauron. Maybe the keyblade has unique powers that can help turn the tide in battles against the orcs.
Start with a bang! Have the keyblade wielder suddenly thrust into a new and strange world without warning. For example, they could be in the middle of a battle in their own world, and then in a flash, they're in a post - apocalyptic world filled with zombies. This immediate change will grab the reader's attention.
One way to do a Keyblade in anime worlds crossover fanfiction is to first establish the rules of the Keyblade within the context of the anime world. For example, if it's a Naruto crossover, you might decide how the Keyblade's magic would interact with chakra. You could also create a story where the main character from the anime discovers a Keyblade. Maybe Naruto himself stumbles upon a Keyblade during one of his adventures and has to learn how to use it to defeat a new kind of enemy that's immune to normal ninja techniques.
In a Keyblade in anime worlds crossover fanfiction, a crossover with Code Geass could be fascinating. The Keyblade wielder could be involved in the political intrigue of the Code Geass world. Maybe the Keyblade has the power to break the Geass's control on people. Another concept is a crossover with Fairy Tail. The Keyblade could be seen as a very powerful magical item in the Fairy Tail guild, and the wielder could go on quests with the Fairy Tail members, using the Keyblade's abilities to defeat powerful dark mages.
Perhaps a great plot idea would be to have a character who is an outsider to the Keyblade War but gets dragged into it. This character could bring a fresh perspective and different skills or abilities. They might try to find a way to end the war through negotiation rather than fighting, which would add a whole new layer to the story. And you could also explore how the power of friendship and trust can be a game - changer in the midst of all the chaos and battles.
The interactions between the Blue Ranger from Mystic Force and the Blue Ranger from SPD could be really interesting. They might start off a bit competitive, trying to show off their respective skills, but then learn from each other.
One plot idea could be that Naruto discovers the Keyblade while on a strange new mission outside of the Hidden Leaf. He initially has no idea how to use it but through trial and error, he starts to unlock its powers. Another idea is that the Keyblade is a gift from a mysterious sage who believes Naruto has the potential to use it to save both the Naruto world and the world connected to the Keyblade. Maybe Naruto has to use the Keyblade to fight against an enemy that can manipulate time and space, which is a new and dangerous threat to his village and friends.
One idea could be to have the characters from RWBY encounter the Beasts in a shared realm. For example, Ruby could be intrigued by the unique abilities of the Beasts and try to learn from them while also teaching them about her own world's Dust magic. Weiss might initially be cautious but then find common ground in the Beasts' sense of honor. Blake could relate to the Beasts' more wild and primal nature, and Yang would be eager to test her strength against them.
Some characters from other franchises that are popular in keyblade crossover fanfiction are Cloud from Final Fantasy. His cool demeanor and powerful sword - fighting skills (which can be translated to keyblade skills in the crossover) make him a fan - favorite when combined with the keyblade concept and Kingdom Hearts - like settings.
In keyblade crossover fanfiction, a cool concept is the creation of new keyblade forms inspired by the combined elements of different franchises. This might involve a keyblade that has the magic of a certain wizard from one series and the physical design elements from another. It allows for a lot of creativity in terms of both appearance and power.
One idea could be Sora training a group of new male keyblade wielders. He could teach them his unique fighting techniques and the importance of the heart. It would be cool to see how he imparts his wisdom.