In this kind of fanfiction, Ash and Kari are the central characters. But from Pokemon, Serena could be included. She has her own dreams and skills related to Pokemon performances. In Yu - Gi - Oh Zexal, Tori would be a good addition. She's a friend of Yuma and can bring in the perspective of someone who is learning about dueling. Also, Gary from Pokemon could be added. His rivalry with Ash can add some tension and competition. And from Yu - Gi - Oh Zexal, Bronk can be included. He's a regular guy trying to improve his dueling skills, which can create some relatable moments in the story.
Well, a cool plot might be that Kari discovers she has a hidden ability to communicate with Pokemon, which is very rare in the combined world of Pokemon and Yu - Gi - Oh Zexal. Ash helps her understand and develop this ability. Meanwhile, they encounter a powerful villain who is using corrupted Pokemon and Yu - Gi - Oh Zexal cards to create chaos. They then journey to find a way to purify the villain's creations and restore peace. Also, maybe they meet some characters from both franchises who are also on a quest, and they join forces.
Harry Potter himself is often a popular crossover character. Fans like to imagine him in the world of Yu - Gi - Oh Zexal, using his magic skills in duels. Another popular one is Yuma Tsukumo from Yu - Gi - Oh Zexal. People enjoy seeing him at Hogwarts, making friends and learning about magic. Hermione Granger is also a common choice. Her intelligence would be a great asset in the Zexal world, and she could probably figure out the mechanics of dueling quickly.
Another theme is friendship. When characters from different series meet, they usually form new friendships or strengthen existing ones. This is often shown through them working together in duels or facing challenges as a team. In a lot of these fanfictions, you'll see Zexal characters and characters from other Yu - Gi - Oh shows bonding over their shared love for dueling.
One possible plot could be that Naruto somehow gets transported to the Yu - Gi - Oh Zexal world. He might meet Yuma and his friends. Since Naruto is a ninja with unique skills like shadow clones, he could help Yuma in his duels. For example, Naruto could use his clones to distract opponents while Yuma figures out his strategy. Maybe they team up to face a common enemy who is causing chaos in both the ninja world and the Zexal world.
Naruto would probably be very curious about the Yu - Gi - Oh Zexal world. He'd be excited to learn about the duels and the number cards. Yuma, on the other hand, would be amazed by Naruto's ninja abilities. They would likely start off as friends, with Naruto showing Yuma some basic ninja moves like tree climbing. Yuma would then show Naruto how to play a simple Yu - Gi - Oh Zexal duel.
Yuma Tsukumo is definitely a popular choice. He's the main character, so there's a lot of material to work with. His growth as a duelist and his relationship with Astral are rich areas to explore. Another popular character is Shark. His complex backstory and his evolution from a rival to an ally are really interesting to write about. And then there's Kotori, as she provides a different perspective in the dueling world being a supporter of Yuma and having her own story arcs related to the group's adventures.
Another concept is a fusion of their powers. Suppose a villain creates a device that combines the power of the tailed beasts from Naruto and the Numbers from Yu - Gi - Oh Zexal. The heroes from both universes have to work together to stop this new threat. Yuma could use his ability to communicate with his monsters and Naruto could use his Sage Mode to sense the new evil power.
Ash from Pokemon and Yugi from Yu - Gi - Oh would be really interesting. Ash is a fearless and determined Pokemon trainer, while Yugi is a strategic and kind - hearted duelist. Their different personalities and skills would create a great dynamic. They could learn from each other, like Ash teaching Yugi about the bond between a trainer and a Pokemon, and Yugi showing Ash the intricacies of dueling.
One popular 'yu gi oh zexal crossover fanfiction' is 'Zexal Meets the Past'. It has an interesting plot where characters from Zexal interact with classic Yu - Gi - Oh characters in a unique tournament setting.
In a Yu - Gi - Oh GX crossover fanfic, I think Aster Phoenix would be a great addition. His cool and confident demeanor and his strong connection to his cards could add a lot of depth. Also, the Ojama Trio could be included for some comical relief. They could get into all sorts of wacky situations in the crossover world. Additionally, Atticus Rhodes. His laid - back attitude and his relationship with Alexis could be explored further in a crossover, especially if there are elements of romance or family drama involved in the new world.