Yes, in some fanfictions, Naruto can be depicted as having the Sharingan. Fanfiction writers often like to play with different character abilities and combinations, so it's not uncommon to see Naruto with the Sharingan in their creative works.
The Sharingan in such a fanfiction could be used as a tool for a Fairy Tail character to gain an edge in their battles. They might initially struggle to control it, but as they learn more about it, they become a formidable force. For instance, they could use the Sharingan's genjutsu abilities to deceive opponents in the Fairy Tail battles.
Sakura could be an unexpected character to have the Sharingan. It would completely change her character dynamics. She could use it to enhance her medical ninjutsu, seeing the internal body structure more clearly. Also, she could become a more formidable fighter, using Sharingan - based genjutsu to her advantage.
It could be Sasuke. In many Naruto - related stories, Sasuke has the Sharingan and is often the target of others' tricks or manipulations due to his complex personality and his power.
A fanfiction could be set in an alternate universe where the Sharingan and Byakugan have different powers than in the original Naruto series. For example, the Sharingan could be used to directly communicate with the spirits of the dead, and the Byakugan could see into different dimensions. A young ninja discovers these new abilities and has to use them to save his village from a mysterious threat.
In fanfiction, if Naruto has the Sharingan, it can change his relationships. He might have a different connection with Sasuke, who is originally associated with the Sharingan. Also, it could lead to new story arcs. For example, he may need to learn how to control this new power, which could involve training with characters like Kakashi who also has the Sharingan. It can also attract the attention of different villains or groups who are interested in the power of the Sharingan.
In some cases, the 'naruto master of the sharingan fanfiction' could be about Naruto using the Sharingan to uncover secrets about the Uchiha clan that were previously unknown. This could tie into the overarching Naruto story, such as revealing more about the history of the Uchiha massacre or the true nature of the Sharingan's origin. It may also bring new story arcs where Naruto has to deal with ancient threats that were once related to the Uchiha and their powerful eyes.
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.
In fanfiction, the Rinnegan is often depicted as more powerful than the Sharingan in many ways. The Rinnegan has abilities like the Six Paths techniques which can be extremely overpowered. For example, it can allow the user to control gravity, summon large creatures, and even revive the dead. While the Sharingan has its own set of cool abilities like predicting movements and casting genjutsu, it seems limited in comparison when it comes to the grand scale of power shown by the Rinnegan in most fanfictions.
One possible concept could be a story where a character from Fairy Tail somehow obtains the Sharingan from the Naruto universe. This could lead to all kinds of new abilities and storylines. For example, they might use the Sharingan's predictive abilities in battles within the Fairy Tail world, creating a whole new dynamic in combat.