Power and its consequences. Often in these fanfictions, characters with Sharingan eyes have to deal with the great power it brings. They might face temptations to misuse it or struggle to control it, like Sasuke did in the original series.
One great fanfiction could be 'The Hidden Power of Sharingan in Naruto's World'. It explores how a new character with Sharingan abilities impacts the existing Naruto universe. It has some really cool battles where the Sharingan's powers are used in unique ways.
In fanfiction, Naruto could get the Sharingan through a blood - related connection that is revealed later. For example, it could be discovered that he has some distant Uchiha ancestry that gets activated somehow. Maybe a powerful enemy's attack awakens this dormant Uchiha blood in him, and as a result, he develops the Sharingan. It could also be that a powerful sage or a new character uses their own unique powers to bestow the Sharingan upon Naruto for a specific purpose.
One interesting fanfic could be about a character who unexpectedly awakens the Sharingan in a non - Uchiha way. Maybe a young ninja from a different clan has a near - death experience during a battle against powerful enemies and suddenly their eyes change to Sharingan, granting them new powers and a connection to the Uchiha legacy.
Itachi Uchiha is also extremely popular. His tragic backstory and his powerful use of the Sharingan make him a prime candidate for fanfic exploration. Writers might create stories that expand on his time in the Akatsuki or his relationship with Sasuke before his death.
If Naruto had the Sharingan in fanfiction, it would likely lead to some interesting power - up scenarios. He could combine the power of the Sharingan with his own massive chakra reserves. This might make him an even more formidable opponent. His training would also take a new turn as he'd have to learn to control and master the Sharingan's abilities, like the different levels of the Sharingan and their unique powers.
Naruto might adapt by first trying to understand the basic functions of the Sharingan. He could start with the simple ability to see chakra flow more clearly. Since he has always been perceptive about people's emotions, he could use the Sharingan to read the emotions of his enemies through their chakra, which would help him in battles.
One drawback could be the strain on his body. The Sharingan is a powerful dojutsu, and Naruto's body, which is used to his own chakra system, might not be able to handle it well at first. This could lead to fatigue and over - exertion during battles.
In this fanfiction concept, Naruto and Sasuke as brothers could lead to a very different Naruto universe. With Sasuke having the Sharingan, he could potentially use it to protect Naruto more often. Maybe they would train together in new ways, combining Sasuke's Sharingan - related jutsu with Naruto's Uzumaki power. For example, Sasuke could use his Sharingan to analyze Naruto's chakra flow and help him master new forms of the Rasengan faster.
Yes, in some fanfictions, Naruto is given the Sharingan. Fanfiction writers often like to play with the concepts and powers in the Naruto universe, and giving Naruto the Sharingan can lead to some really interesting storylines. It might be a result of some kind of power transfer or a unique plot device.