Yes, there are quite a few. You can check out fanfiction websites like FanFiction.net or Archive of Our Own. Some stories might explore Naruto's newfound soul magic abilities in relation to his existing ninja skills, like how it could enhance his Rasengan or his shadow clone jutsu.
Some writers create 'Naruto has no magic' fanfictions because they want to see how the characters would develop in a different context. Without magic, Naruto and other characters would have to rely more on their natural abilities, intelligence, and the training they've received. This can lead to different character arcs and relationships. For example, Naruto might have to work even harder to prove himself and gain the respect of the village. It also allows for a fresh take on the story, as it breaks away from the traditional magic - filled Naruto narrative.
Sure. There's one where Naruto discovers magic in a world that is a blend of the Naruto universe and a medieval magical world. He is transported there accidentally and has to learn magic to survive. The unique part is that his ninja chakra is somehow related to the magic energy there, and he has to figure out how to make them work together.
One interesting storyline could be Naruto using the takeover magic to assume the powers of different powerful ninja. For example, he might take over the Sharingan abilities from an Uchiha. This would create a whole new dynamic in battles and his relationships with other characters.
One possible plot development could be Naruto using his newfound magic in combat. He might combine his ninja skills with magic spells, creating unique and powerful attacks. For example, he could use shadow clones and then have each clone cast a different magic spell, overwhelming his enemies.
It makes Naruto more versatile. Instead of relying solely on his own chakra and ninja techniques, he can now use the powers he takes over. This forces him to adapt quickly to new abilities, which speeds up his character growth.
Naruto would likely become more confident. With magic at his disposal, he would have new tools to face challenges. His already strong will would be further enhanced as he masters the magic, knowing he has more power to protect his loved ones.
In this type of fanfiction, magic could play a role in character development. For Naruto, experiencing a different type of power system like magic in the Young Justice world could make him question his own ninja way. He might start to adapt some of the magic concepts into his own fighting style. And for the Young Justice characters, learning about Naruto's 'magic' (chakra) could open their eyes to new ways of thinking about power and how to use it more effectively.
In fanfiction about Naruto and Demon Slayer with magic, one interesting aspect is the potential for new power - ups. For instance, a character could combine the Sharingan from Naruto with a Demon Slayer's special vision ability and create a super - powered form of sight. Also, the magic could be used to explain some of the more mysterious elements in both series. Maybe the curse marks in Naruto are actually a form of suppressed magic, and in the fanfiction, a character figures out how to fully utilize this magic, taking on a new and powerful form inspired by Demon Slayer's demon - slaying forms.