Well, there are quite a few interesting concepts. For example, some fanfictions explore what would happen if the Sorting Hat was used in Hyrule. Would Link be a Gryffindor or a Slytherin? Another idea is that the magical creatures from Harry Potter exist in the world of Breath of the Wild. Imagine Hippogriffs flying over Hyrule Castle. And then there's the idea of the Deathly Hallows being important artifacts in the Breath of the Wild universe, which could change the whole dynamic of the story.
There are indeed crossovers. Fanfiction writers love to mash up different universes. In Breath of the Wild - Harry Potter crossovers, we might see the Guardians from Breath of the Wild being studied by the wizards in Hogwarts. Or perhaps Link uses his combat skills along with some borrowed magic from Harry Potter to fight Ganon in a more magical - infused battle. These crossovers offer fresh perspectives on both franchises.
One idea could be exploring Link's life before he woke up in the Shrine of Resurrection. Maybe he had a family or a special friendship that was lost. Another plot could be a story where Zelda gets lost in a new, uncharted part of Hyrule and Link has to find her using only his wits and the help of some new, unique characters. A third plot idea is to have a fanfiction where the monsters in Breath of the Wild form an alliance to take over Hyrule, and Link has to find a way to break their unity and save the kingdom.
One idea could be a crossover with the Legend of Zelda: Ocarina of Time. Link from Breath of the Wild could meet Young Link and they could team up to fight a common enemy that has somehow traversed between their timelines. Another could be a crossover with a non - Zelda franchise like Final Fantasy. Link might encounter a group of Final Fantasy characters in Hyrule and they have to combine their skills to save both their worlds from a dark force.
One idea could be exploring Link's life before he woke up in the Shrine of Resurrection. Maybe he had a family or a best friend in a small village that was lost during the Calamity. Another idea is to focus on Zelda and her struggles with her powers in a more in - depth way, like her inner thoughts and fears during her time trying to unlock her sealing power.
One interesting plot twist in 'Naruto: A Link to the Wild' is that Naruto's shadow clones start to develop their own consciousness based on the different environments in Hyrule. This creates a whole new set of challenges for Naruto. In 'Wild Naruto', a plot twist could be that the Koroks in Breath of the Wild are actually the descendants of a lost shinobi tribe. It's a really strange and fascinating connection. And in 'The Hybrid World of Naruto and Breath of the Wild', there's a plot twist where the two main characters from each universe, Naruto and Link, have to swap their powers to defeat an ultimate enemy that can only be defeated by using the other's abilities.
One idea could be a crossover with the Final Fantasy series. Link could meet characters like Cloud and they could team up to fight a new, powerful enemy that threatens both their worlds. Maybe the magic systems of both universes get combined in an unexpected way.
One idea could be Paya's adventures in exploring a new, uncharted area of Hyrule. She could discover ancient Sheikah secrets that were lost to time. Another idea is a fanfic where Paya has to face a powerful enemy on her own and overcomes it through her wits and the skills she has learned. Maybe a story about Paya forming an unexpected friendship with a character from a different race in Hyrule, like a Goron or a Zora, and how they learn from each other's cultures.
Another interesting aspect could be a magical or mysterious force that binds the harem together. It could be an ancient Hylian magic that is awakened when Link forms these special relationships. This force could give them new powers or abilities that they use to face the threats in Hyrule.
One interesting plot idea could be Bulma inventing some sort of device that allows her to understand and use magic, which then leads to her enrolling in Hogwarts. Another could be Harry Potter traveling to the Dragon Ball universe and Bulma helping him learn about their technology. There could also be a plot where Bulma's scientific knowledge is used to solve some of the mysteries in the wizarding world, like how to defeat a particularly difficult dark magic.
A really cool plot is when the Wakandan warriors are brought into the wizarding world to fight against the dark forces. Their combat skills combined with magic could make for some epic battle scenes. Also, there could be a story where a magical artifact from Harry Potter ends up in Wakanda and causes a stir, leading to a journey of discovery about both worlds. This would involve characters from both universes working together to understand the significance of the artifact and how it affects their respective worlds.