It could be really exciting. Maybe Sora from Kingdom Hearts could learn kung fu moves in a new world inspired by Chinese martial arts. He could use his keyblade in combination with kung fu stances for some epic battles against Heartless.
A new character could be introduced as the main character. This character could be a native of the kung fu - inspired world in the crossover. They could be the one to teach Sora and his friends about kung fu, and then join them on their journey to fight against the darkness that threatens both worlds.
Another concept is that the spirit animals in the Kung Fu Panda world are somehow related to the tailed beasts in Naruto. For example, Po discovers that he has a connection to the Nine - Tailed Fox within Naruto. They have to work together to balance the power of these spirits and beasts to prevent chaos in both universes. This could involve a lot of training sequences where they learn from each other's combat styles and philosophies.
One great 'Kingdom Hearts Crossover Fanfiction' is 'Kingdom Hearts and Final Fantasy: The Convergence'. It combines the elements of Kingdom Hearts and Final Fantasy in a really interesting way. The characters from both universes interact in a believable manner, and the plot keeps you hooked from start to finish.
First, you need to have a solid understanding of both universes involved. For example, if you're doing a Kingdom Hearts and Pokemon crossover, know the Pokemon types, their abilities, and how they interact. Also, be familiar with Kingdom Hearts' keyblade mechanics and the different worlds. Then, create a unique plot that ties the two together. Maybe the Pokemon are new forms of Heartless or something.
The plot could also involve a competition. The ninjas from Naruto's world are invited to a grand martial arts tournament in the Kung Fu Panda world. Naruto, Sasuke, and the others compete against Po, the Furious Five, and other kung fu masters. Along the way, they learn from each other's fighting styles and develop new techniques.
Another theme is friendship. Sora is all about making friends, and in crossovers, he forms new bonds with characters from different franchises. For example, he might become friends with Sonic the Hedgehog and they team up to fight a common enemy. It shows how his positive attitude can bridge different universes.
There are quite a few. One interesting one might be on FanFiction.net. You can search using the tags 'Sonic' and 'Kingdom Hearts' to find crossovers that combine the high - speed, energetic world of Sonic with the complex and magical Kingdom Hearts universe. It's always fun to see how authors blend Sonic's speed and his friends' abilities with the Keyblade - wielding heroes of Kingdom Hearts.
One great Kingdom Hearts Terra crossover fanfiction is 'Terra's New Journey'. It takes Terra to a different world where he has to face new challenges and make unexpected alliances. The story really dives deep into Terra's character, exploring his strengths and weaknesses in this new setting.
Well, one unique aspect is the exploration of Terra's untapped potential. In crossover fanfictions, Terra can be put in situations that the original game didn't cover. For example, he could face off against characters from other franchises, which shows how his abilities stack up against different foes.