Naruto's character development would be a journey. At first, he'd be excited about the new power of Devil Slayer Magic. But as he trained and used it, he'd realize the responsibility that comes with it. He might struggle with the idea that Devil Slayer Magic can be used for destruction as well as protection. His relationships with his friends would also change. Some might be worried about him using this new magic, while others might encourage him. Through these experiences, Naruto would mature and become a wiser and more powerful character.
Well, if Naruto had Devil Slayer Magic, it could be really cool. He could use his chakra to enhance the magic. For example, his Rasengan could be combined with Devil Slayer Magic to create a more powerful and destructive attack. Maybe he could use the heat - based Devil Slayer Magic to make his attacks even hotter than normal fire - based jutsus.
The character's moral compass could also shift. Let's say a Naruto character who becomes a lava dragon slayer starts using their power for revenge at first. But as they face the consequences of their actions and see the harm they cause, they realize the error of their ways. They then start to use their power to protect and uphold justice. This change in their values would be a significant part of their character development, as they go from being self - centered to being more selfless and heroic.
A possible fanfiction could involve Naruto learning Fire Devil Slayer Magic. Maybe he meets a character from the world of Devil Slayer who teaches him this magic. It could give him new powers and abilities, like the ability to control and manipulate fire in a different way compared to his normal jutsu.
It could be wind - based, considering Naruto's affinity for wind techniques in his own world. He might be able to create powerful gusts of wind that can cut through enemies like a dragon's roar.
Sasuke would be really interesting. He already has a dark and brooding nature. Adding Ice Devil Slayer powers would enhance his cool and aloof demeanor. He could use the ice powers in combination with his Sharingan and fire - based jutsu in really unique ways. For example, he could freeze the water created by a water - style jutsu and then shatter it with his ice powers.
He could use it for offense, like shooting out intense streams of fire at his enemies. It would be a more direct and powerful form of fire - based attack compared to some of his regular jutsu.
The God Slayer Magic might change Naruto's view of power. He has always been focused on his ninja way and his goal to become Hokage. But with this new magic, he would have to reevaluate what power means and how to use it responsibly. He might start to see that there are different forms of power beyond just ninjutsu and chakra. This could lead to a more complex and mature Naruto in the fanfiction.
If Naruto was Minato's younger brother in fanfiction, his character development would take a different path. He would not have the same insecurities about being alone and unloved. This would lead to a more positive and less desperate Naruto. He would still strive for strength, but perhaps for different reasons, like to uphold the family name. His relationships with others, such as with Hinata, might develop more smoothly as he has a more stable emotional foundation from the start.
One common theme is the combination of powers. Naruto's ninja powers are merged with devil slayer abilities in many fanfictions. For example, he might use his Rasengan with a devil slayer's fire - based attack.
He'd be extremely powerful. Naruto already has a lot of chakra and strong ninja skills. Adding dragon slayer magic would give him new ways to attack and defend. For instance, he could use fire dragon slayer magic to enhance his fire - based jutsus.