It will likely make him more confident. With this new power, he'll be able to take on tougher challenges and succeed. This success will boost his self - esteem.
Naruto could also become more isolated. If the ancient power is something that others fear or don't understand, they might avoid him. This will force Naruto to deal with a sense of loneliness, which is a big change from his usually social and friendly self. He'll have to find a way to balance his new power with his relationships, and this struggle will shape his character in a new way.
If the scrolls contain difficult knowledge or a great responsibility, Naruto might become more serious. He would have to grow and adapt to handle whatever new situation the scrolls present. For example, if there are dangerous jutsu in the scrolls, he has to be more cautious and mature in his decisions regarding their use.
He might become more confident. Having Excalibur would give him a new sense of power and purpose. He could be more assertive in his actions and decisions.
Perhaps it's an ancient artifact with power. It could be a weapon like a sword or a staff that has been enchanted with some sort of magic. This power could enhance Naruto's physical abilities and give him an edge in battles. When he wields it, he might be able to access special techniques related to the artifact.
If the power stone gives Naruto access to a great amount of knowledge, it could make him more mature. He would understand the deeper workings of the ninja world and the history behind the conflicts. This new - found knowledge could also make him more diplomatic, as he would see the bigger picture. For example, he might be able to negotiate better treaties between the villages. He would no longer be just the brash young ninja but a more well - rounded leader with the help of the power stone.
Naruto would become more brooding. His usual sunny disposition would be tempered by the knowledge of his vampire side. He'd be more cautious about his relationships, fearing he might accidentally harm his friends. For example, he might be hesitant to get too close physically during hugs or high - fives in case his vampire strength gets out of control.
It would change the combat dynamics a great deal. Guns are much more powerful in terms of long - range attacks compared to traditional ninja weapons. This would mean that strategies for battles, both in the village and against enemies, would need to be rethought. For instance, the importance of cover and stealth would increase significantly.
If Naruto has the power of Sans Fanfiction, it might introduce some unique interactions. For instance, Sans' power of dodging attacks effortlessly could be combined with Naruto's own combat skills. This could lead to some really interesting fight scenes where Naruto seems almost unhittable. Also, it could affect how he approaches his enemies, as he now has a different set of powers to rely on.
The bugs could make Naruto more cautious. Since they are ancient and might be dangerous, he would have to think before acting. This would be a new side of him as he's usually quite impulsive.
In the fanfiction, Naruto might develop new skills related to Kaguya's power. As he delves into her story and the nature of her abilities, he could learn to control or even mimic some of her powers. This would not only make him stronger but also change his fighting style. His understanding of the origin of chakra and the world itself would deepen, which could lead to him being more of a philosopher - like figure in the fanfiction. He might start to question the cycle of hatred in a more profound way, seeing how Kaguya's actions were influenced by her own experiences. Also, his relationships with other characters could change. For example, if he discovers that Kaguya had some connection to certain characters in the present, he might treat those characters differently or have a newfound respect for them.
In a fanfiction, Naruto having the power of the sun could potentially have a huge impact on the chakra system. Since the sun is such a powerful energy source, it might disrupt or enhance the existing chakra flow. He could develop new jutsu that are based on solar energy rather than just the normal chakra types. This could lead to a whole new set of skills and abilities that are unique to him, and it would force his opponents to completely re - evaluate their strategies when facing him.