Well, one possibility is that Naruto's new Sharingan power could give him an edge in battles against stronger foes. He might be able to quickly analyze their moves and counter them more effectively.
In this fanfiction, Naruto could use the Sharingan to understand the Uchiha clan's secrets better. This might lead him to uncover hidden jutsu or knowledge that was previously lost. Maybe he could even use this knowledge to bring about peace between the Uchiha and the rest of the village. He could also use the Sharingan's abilities like genjutsu in a unique way, combining it with his own ninjutsu skills to create new and powerful attacks.
One possible plot development could be that Naruto uses his new - found control of the Nine - Tails to defeat a powerful enemy that was previously unbeatable. He might be able to combine his own ninja skills with the Nine - Tails' power in a more efficient way, like creating new and unique jutsu.
In this fanfiction, a likely plot development could be that Naruto starts to experience strange visions or memories from Shisui's brother due to the Sharingan. This causes him to go on a journey to discover the secrets behind these visions. Also, the Leaf Village elders might become suspicious of Naruto's new power and try to keep an eye on him, which creates internal conflicts within the village.
A plot development might involve Naruto struggling to control the Rinnegan at first. Sasuke, noticing this, believes he can defeat Naruto easily with his Sharingan. But as Naruto starts to master the Rinnegan, he shows new abilities that shock Sasuke. This could lead to a situation where they have to team up against a common enemy who is after the power of both the Rinnegan and the Sharingan. Or perhaps a prophecy is revealed that states only one of them can keep their dojutsu power and they must fight to decide who keeps it, leading to a moral and power - based struggle.
One possibility is that Naruto's friends launch a rescue mission. They would use their unique skills, like Sasuke's Sharingan or Sakura's medical ninjutsu combined with her combat skills, to find and save Naruto.
One interesting plot development could be Naruto having to deal with the Uchiha clan's history and secrets that come with the Sharingan. He might have to face the Curse of Hatred that the Uchiha are known for. Another aspect could be his relationship with Sasuke changing. Since Naruto now has a part of what makes Sasuke special, it could create a new dynamic between them, either one of rivalry or cooperation in a different way.
It could be Orochimaru. Since he has always been interested in obtaining powerful abilities, he might see Naruto with the Sharingan as a threat and try to take it for himself.
One possible development is that Naruto becomes a more vengeful character. The neglect from his family combined with the power of the Sharingan could make him angry and determined to show them up. Another is that he could become a loner, relying only on his own skills and the Sharingan. He might be hesitant to trust others at first. But as time goes on, he could learn to open up and form strong bonds with those who accept him for who he is.
One possible plot development could be Naruto using his new jutsu to break Yugito free from an enemy's trap. Another could be that Naruto's words break Yugito's negative mindset.
There could be a plot where they discover a new threat to the villages while living together. They then use their combined skills and knowledge to investigate. Gaara's knowledge of the desert and its secrets could be combined with Naruto's intuition and quick - thinking. They might also find some ancient power or technique during their investigation that could change the balance of power in the ninja world. This would lead to them having to decide how to handle this new power, whether to keep it secret or share it with the other villages for the greater good.
A possible plot development could be that Naruto's connection to the Nine - Tailed Fox gives him an advantage in a situation where Shirou was at a disadvantage. For example, if there was a powerful dark force in the story, Naruto could use the Nine - Tailed Fox's power to fight it off, while Shirou might have struggled more. Also, Naruto's charisma could attract different allies compared to Shirou, and these new allies could bring in their own sub - plots and story arcs.