The consequences could be far - reaching in the fanfiction. Naruto's relationship with Kakashi might change. There could be a deeper sense of respect and a new kind of bond formed because of this transfer. In terms of power, Naruto could unlock new jutsus or abilities that are related to the Sharingan. He might be able to combine his existing Rasengan techniques with the Sharingan - enhanced perception. This could make him an even more formidable opponent. However, it could also put a strain on his body. The Sharingan is known to consume a lot of chakra, and Naruto's body might need to adapt to this new power drain. If he overuses it, it could lead to exhaustion or even long - term damage.
He might have increased visual abilities. For example, he could see chakra flow more clearly, which would be a great advantage in battle.
In some fanfictions, it could be due to a special jutsu gone wrong. Maybe a jutsu that Kakashi was using to transfer some of his chakra to Naruto for a mission accidentally transferred his Sharingan power as well.
Well, when the Sharingan is neglected in fanfiction, it can lead to a less diverse range of powers and abilities being represented. The Sharingan has unique abilities like predicting movements and copying jutsu, and without it, stories may lack that kind of strategic and combat - related depth. Also, it can make the Uchiha clan seem less important in the fan - created Naruto universe, which goes against the significance they have in the original series.
One great fanfiction could be about Kakashi using his Sharingan to train Naruto in a special jutsu. Maybe he shows Naruto how to better perceive an opponent's moves by using the Sharingan's ability to analyze. This could lead to Naruto developing a new and powerful technique that combines his own chakra control with the insights from the Sharingan.
One potential implication is that Naruto's fighting style would change drastically. He would have to learn how to use the Sharingan's abilities like predicting movements and copying jutsus. This could make him an even more formidable opponent.
One potential implication is that Naruto would gain enhanced visual abilities. The Sharingan can copy jutsu and see through illusions, so Naruto would be even more powerful in combat. For example, he could quickly learn new enemy techniques during battles.
He would likely become extremely powerful. His combat abilities would be enhanced significantly as the Rinnegan gives access to powerful jutsus. He could also gain new insights into the nature of chakra and the world around him.
In the Naruto universe, while it's highly unlikely in the official canon, in fanfiction, anything can be made possible. The Sharingan is a kekkei genkai exclusive to the Uchiha clan. Danzo had Sharingan in his arm which he obtained through rather unethical means. For Naruto to get it from him in fanfiction, it could be written through some sort of experimental jutsu gone wrong or right. Maybe a jutsu that was meant to transfer power ended up giving Naruto the Sharingan. However, this would completely change Naruto's power dynamics and character arc as the Sharingan comes with its own set of abilities like the ability to copy jutsu, predict movements, and use genjutsu.
The plot implications are quite significant. For starters, it could change Naruto's relationships with his friends. Some might be jealous or afraid of his new power. Also, it could attract the attention of dangerous enemies. Those who were after Shisui or the Sharingan might target Naruto. This would put Naruto in a whole new set of dangerous situations and force him to grow and adapt in different ways. Additionally, it might also change the way Naruto approaches his ninja training, as he has to learn to master the Sharingan's abilities.
One idea is that an enemy targets Kakashi's Sharingan and Naruto has to protect it. Along the way, Naruto learns more about the Sharingan's capabilities and how to use it against the enemy. This would be a great opportunity for Naruto to grow as a ninja and for their friendship to deepen.