In many Naruto fanfictions, Itachi is often depicted as an extremely powerful Mangekyou Sharingan user. His original abilities in the canon, like Amaterasu, are further enhanced in fan works. Sasuke is also a common focus. His Mangekyou Sharingan's powers can vary greatly from one fanfiction to another, sometimes with new and unique jutsu created by the authors. Another character could be Madara. Fanfiction writers love to explore the full potential of his Mangekyou Sharingan, often giving him abilities that were only hinted at in the original series.
Another common type of main character is a reincarnation of an ancient Sharingan user. In one fanfiction, Rei is a reincarnation of a long - dead Sharingan master. Her Sharingan has the power to see the future, and she uses this to try and prevent a great war from breaking out in the Naruto world. She teams up with Naruto and Sasuke in this story.
One great 'Naruto Most Powerful Sharingan Fanfiction' is 'The Ascent of the Sharingan God'. In this story, the main character with the most powerful Sharingan goes on a journey to master all its abilities and defeat the ultimate evil. It's full of intense battles and character development.
It would probably be Sasuke. His Sharingan gives him so many abilities like enhanced perception, the ability to copy moves, and eventually the Mangekyo Sharingan powers. In the My Hero Academia world, these skills would be extremely powerful. He could easily outwit and overpower most of the heroes and villains there.
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.
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.
In a Highschool DxD OC and Sharingan fanfiction, you can incorporate the Sharingan powers in the story by making it a source of mystery and envy among the other characters. The OC could use the Sharingan's ability to enter the minds of others (a more advanced form) to gather information about the devils' plans. This would make the OC a valuable asset to their group. Also, the Sharingan could have a connection to some ancient prophecy in the Highschool DxD world, which would add more depth to the story and make the powers more significant in the overall plot.
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.
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.
The Sharingan in a Naruto fanfic can be a really interesting element. It often adds depth to the story. Writers can explore different aspects of it, like the unique powers of different levels of Sharingan, such as the Sharingan's ability to copy jutsus. It can also be used to show the character's growth. For example, a character might start with a single - tomoe Sharingan and progress to the Mangekyo Sharingan, which could be a significant plot point in the fanfic.