In many of these fanfictions, Naruto uses magic to surprise his opponents. For example, he might use magic to teleport behind an enemy instead of using the normal ninja body - flicker technique. Magic gives him an unexpected advantage.
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.
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.
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.
Magic in this type of fanfiction can be used to bridge the gap between the two universes. It can make the transition of characters from one world to another more believable. For example, if Naruto characters enter the Demon Slayer world, magic could be the reason they can adapt to the new rules and powers there.
A Naruto ice magic fanfiction could also explore the origin of this magic within the Naruto universe. It could be tied to an ancient clan that was wiped out, and Naruto is the reincarnation of one of their members. As he unlocks the ice magic, he also uncovers the secrets of this forgotten clan. He might face challenges from other villages who fear this new power in his hands, and he has to prove that he will use it for good.
A Naruto magic circuits fanfiction could be really interesting. It might explore how the concept of magic circuits from other magical universes could be incorporated into the Naruto world. For example, perhaps ninjas with magic circuits could have unique abilities that combine ninjutsu with magic. It could also change the power dynamics among the characters, like Naruto himself having magic circuits and using it to enhance his Rasengan with magical elements.
Another possibility is that he specializes in summoning magic. But instead of summoning ninja animals, he summons magical creatures from different magical realms. These creatures could help him in battles or in solving magical mysteries.
If Naruto learned magic in a fanfiction, it could completely change the power dynamics in the Naruto universe. For example, his already formidable combat skills combined with magic could make him nearly unbeatable. He might be able to use magic to enhance his jutsu, like adding an element of fire magic to his Fireball Jutsu to make it even more powerful. Also, it could change his relationships. His friends might view him differently, either with awe or a bit of envy. And his enemies would surely be more afraid of him, forcing them to come up with new strategies to deal with this magically - enhanced Naruto.
They introduce new powers. For example, a magic bloodline can bring in abilities like teleportation through magic portals, which is not a common ninja ability in the original Naruto. This adds a new dimension to the combat and survival aspects in the universe.