A great aspect of a Final Fantasy 10 and Kingdom Hearts fanfiction crossover could be the character relationships. Yuna and Sora, for instance, could form an interesting friendship. Yuna's calm and spiritual nature might contrast and complement Sora's more impulsive and adventurous side. They could learn from each other's experiences, with Yuna teaching Sora about the summoning and the fayth, while Sora shows Yuna the power of the Keyblade and the importance of believing in oneself in the face of great evil.
Some crossovers might involve the villains. Orochimaru could be interested in the power of the Heartless or the Keyblades. He might try to manipulate the situation in the Kingdom Hearts world. And the Organization XIII members could see Naruto's unique powers as a threat or a tool for their own plans. This would lead to some intense battles and strategic alliances between the characters of both series.
A really cool aspect in some crossovers is how the different power - ups work. For instance, if a character from Fairy Tail were to get a Keyblade, they would have to learn how to use it in addition to their own magic. This could lead to some really creative storylines, like Lucy using her Celestial Spirit Magic along with a Keyblade to defeat enemies in a way that neither series has seen before.
One interesting concept could be the combination of different magic systems. In Kingdom Hearts, there's the Keyblade magic, and in Final Fantasy, there are various elemental and spellcasting systems. In fanfiction, they might blend these in unique ways, like a character using a Keyblade to cast a Final Fantasy - style spell.
The Kingdom Hearts and Harry Potter crossover is quite popular. You can have Sora and his friends exploring Hogwarts. The contrast between magic in the two universes is fascinating. For instance, Keyblade wielding in the halls of Hogwarts is an amazing concept.
One great Kingdom Hearts crossover in fanfiction is with Final Fantasy. The different worlds and characters blend really well. For example, Sora meeting Cloud in a unique setting. It adds a new layer of adventure and character development.
One interesting crossover could be the characters' power - ups. For example, Sora from Kingdom Hearts might learn some ki - based attacks from the Dragon Ball Super characters. This would be a cool blend of the two universes' fighting styles.
Some Kingdom Hearts 3 crossover fanfictions cross over with the Pokémon universe. Imagine Sora traveling to the Pokémon world, where he has to catch Pokémon instead of using the Keyblade all the time. He could form a team of Pokémon and use them in battles against Heartless that have invaded the Pokémon world. The concept of friendship and growing stronger with your companions, which is central to both Kingdom Hearts and Pokémon, is emphasized in these crossovers.
A cool crossover might involve the jutsu in Naruto being combined with the spells in Final Fantasy 14. Picture Sasuke using a spell like Blizzard III from Final Fantasy 14, but with his own Uchiha - style twist. Also, the ninja villages in Naruto could be compared to the city - states in Final Fantasy 14. The fanfiction could explore how the politics and power dynamics of both worlds interact when characters from each are forced to cooperate. Maybe the Hidden Leaf Village and Limsa Lominsa form an alliance to fight a common enemy that threatens both their existences.
One interesting crossover could be the characters from Naruto using the Materia from Final Fantasy 7. For example, Naruto with the Fire Materia could enhance his Rasengan with fire elemental powers. It would be a really cool visual to see.
One interesting crossover could be the combination of RWBY's unique combat styles with Final Fantasy's magic systems. For example, Ruby's scythe - wielding skills might be enhanced with some of Final Fantasy's fire or ice magic spells. It would create really dynamic and visually stunning fight scenes.