Perhaps there is a wish - granting entity in the fanfiction. Naruto, in his quest to protect his village or friends, makes a wish to be able to use any power necessary. The entity grants him the ability to use Unlimited Blade Works. He then has to train himself to master it, which would be an interesting journey as he tries to balance his ninja way with this new, very different power.
One possible plot could be that during a battle, Harry is transported to a realm similar to the one in Unlimited Blade Works. There, he learns the art of Unlimited Blade Works and brings it back to Hogwarts. He then starts training his friends in this new form of combat. Together, they use it to defend Hogwarts against a new, powerful dark force that is immune to normal wizarding spells. The story could explore how they combine traditional magic with the new abilities, and how they face the challenges of using an unfamiliar power.
Well, it's very likely that there is. Fanfiction is a world full of creative crossovers. 'Harry Potter' has a huge fan base, and so does 'Unlimited Blade Works'. Writers often combine different fictional elements to create something new and exciting. When you search for it, also consider looking at different languages sections on fanfiction platforms because sometimes great crossovers are hidden in non - English sections. You can also join some fanfiction communities or forums to ask if anyone has read or written such a story.
Perhaps Naruto is transported to the world of Unlimited Blade Works and has to learn to use its powers to get back home. Along the way, he could meet characters from that world and form new alliances. He might also bring some of the concepts from Unlimited Blade Works back to his own world and revolutionize the way ninjas fight.
Well, there might be some out there. You could try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in the keywords 'Naruto' and 'Unlimited Blade Works' and see what comes up.
One consequence could be that his enemies are completely caught off - guard. Naruto's new ability to summon a vast number of weapons at will would change the dynamics of battles. Enemies used to his ninja attacks would now have to deal with a whole new type of assault.
Naruto himself is always interesting. In this fanfiction, seeing him adapt to the new powers of Unlimited Blade Works and how it changes his fighting style would be fascinating. He might become more strategic and less reliant on brute force.
A powerful sorcerer who wants to steal Izuku's Unlimited Blade Works power for his own evil purposes. He could be from a hidden world of magic and have minions that Izuku has to fight through.
In such a fanfiction, Naruto might start to reshape the ninja world entirely. He could create new jutsus that are unimaginable with normal power limits. He could also travel to different dimensions effortlessly to learn more about the secrets of chakra and ninjutsu, and then bring back that knowledge to improve the lives of everyone in his own world.
The plotlines in such fanfiction can vary greatly. Some might focus on alternate universes where the events of 'Unlimited Blade Works' take a different turn due to the actions of the OC. For instance, the OC could change the outcome of a battle, which then has a domino effect on the rest of the story. It could also explore new concepts that were not fully explored in the original work, like a different type of magic or a new backstory for a familiar location.
Perhaps in this fanfiction, Naruto enters the Unlimited Blade Works realm and has to face his own inner demons represented as clones within that world. This would be a great way to explore his character deeper as he battles his fears and insecurities.