I don't know which specific game or card game Yu-Gi-Oh zexal refers to. If I can provide more information, I will try my best to answer your questions.
One idea could be to crossover Yugioh Zexal with another popular anime like Naruto. The characters from Zexal could find themselves in the Ninja world and have to adapt to new rules of dueling. For example, they might have to use their duel monsters in combination with ninja techniques.
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Yes, in many fanfictions, Harry can be depicted as an OP (overpowered) assassin. Writers often like to take established characters like Harry and give them new, extreme abilities, and the role of an assassin allows for a lot of creative freedom in terms of combat skills, stealth, and a mysterious backstory.
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.
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.
You can start by choosing an unexpected crossover partner. For instance, if you cross it with a fantasy series like Lord of the Rings. The duelists from Zexal could enter Middle - earth and their duel monsters could interact with the magical creatures there. The goal could be to use dueling to stop an evil force that threatens both worlds.