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.
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.
The characters would likely be initially confused. Yugi might be shocked to see Sailor Moon's magical powers, while Sailor Moon could be intrigued by the dueling concept. They would start to learn from each other. For example, Tuxedo Mask could help Yugi with his strategy, as he is often a strategist in his own battles against the Dark Kingdom.
First, understand the characters from both series well. Know Naruto's determination and his growth throughout the series, as well as Yuma's courage in Yu - Gi - Oh Zexal. Then, create a unique plot that combines elements from both universes in a logical way. For example, you could have a tournament where both ninja skills and dueling skills are required to win.
In a fanfiction, a vampire could offer the Arclight family a deal. Maybe the vampire has knowledge about a powerful Zexal force or a rare card, and in exchange for something the family has, like a powerful artifact or a secret technique, they would share this knowledge. This would create a tense and strategic interaction between them.
Syaoran's martial arts skills combined with his own magical abilities from the Li clan could be used in a new way. He could perhaps use his skills to physically protect Yu - Gi - Oh characters during a duel where the opponent's monsters break free from the virtual field. Meanwhile, Yu - Gi - Oh characters like Joey might be amazed by Sakura's ability to transform her cards into living entities and could learn from her how to better connect with their own cards.
The Yu-Gi-Oh! Zexal manga and anime have their distinctions. Sometimes, the anime might expand on certain aspects or introduce new elements not present in the manga. Also, the character expressions and interactions might be portrayed differently.
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.
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.
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.
In terms of character abilities, Naruto's Rasengan could be translated into a powerful card. When used in a duel, it could have an effect like destroying all the opponent's defensive cards on the field. And the Yu - Gi - Oh GX duelists' ability to summon powerful monsters could be used in a way that the Naruto characters see them as similar to summoning their own animal companions. They could learn from each other's summoning techniques.