Well, a plot could revolve around Naruto using soul magic to bring back the souls of those who were wrongly killed in the ninja wars. This would not only show his power but also his compassion. He might also use it to explore the afterlife and gain new jutsu or knowledge from there. And he could use soul magic to bind the souls of his friends together in a time of great crisis, creating a super - powerful united front.
In a fanfic where Naruto uses Hyoton, he could be on a mission in a frozen tundra. There, he finds a Hyoton - using enemy. Naruto, being the quick learner he is, observes the enemy's moves and figures out how to use Hyoton himself. He then uses it to defeat the enemy and also to rescue his comrades who are trapped in ice. This new ability also makes him a more versatile ninja in future battles.
One idea could be that Naruto discovers a new jutsu that involves using needles as projectiles. He might train hard to master this unique skill and use it to surprise his opponents in battles. For example, he could combine his chakra with the needles to make them more powerful and accurate.
One idea could be that Naruto somehow travels to the Dragon Ball universe and learns the Kamehameha from Master Roshi. Then he returns to his own world and uses it in an unexpected battle against a new and powerful enemy, like a rogue ninja with the ability to absorb chakra. This would add a new dynamic to his fighting style.
Another interesting concept for a 'naruto magic fanfic' is to have Naruto travel to a parallel world where magic is the dominant power instead of chakra. In this world, he has to learn magic from scratch while also trying to find a way back to his own world. He could make new friends who are mages and together they could face the challenges of this new world.
One interesting concept could be the unique ways soul magic is integrated with the Naruto universe. For example, it might involve using soul magic to enhance jutsu or to communicate with spirits in a way that's different from traditional Naruto techniques.
One idea could be Naruto discovers an ancient scroll that details the Mokujin no Jutsu. He then tries to master it in secret to surprise his friends. As he practices, he realizes it has a connection to the forest spirits and he has to earn their trust to fully utilize the jutsu.
Well, perhaps Harry uses magic to communicate with the magical creatures around Hogwarts when he's a kid. He might discover a hidden language that only he can understand, and this leads to him making friends with a shy and rare creature that helps him in some future adventures. Also, he could use magic to create a time - loop in a small part of Hogwarts, like the Room of Requirement, where he can practice spells over and over again without anyone knowing, which gives him an edge in his later battles.
Maybe Twilight Sparkle is forced to use dark magic to save Equestria from an even greater evil. However, she has to struggle with the moral implications. She might have to make sacrifices and deal with the distrust of her friends who are afraid of the dark magic she wields.
There could be a plot where Blair and Soul get transported to a different dimension. They have to find a way back home while adapting to the new and strange environment. Along the way, they meet new characters and form unexpected alliances.
Well, the plot could involve Naruto discovering this take over magic during one of his adventures. Maybe he finds an ancient scroll that teaches him this magic. He then uses it to take over the powers of his enemies in battles, like he takes over the sharingan ability from Sasuke for a short time to gain an edge in a fight against a powerful foe.