Another possibility is a character who is not from a ninja clan at all. They could be a civilian with a natural aptitude for understanding ninja techniques. They study ninja arts from afar and develop their own unique skills through sheer determination and intelligence, and then enter the ninja world as a hidden genius.
It could be an original character created by the fanfiction writer. This character could be from a minor clan in the Naruto universe but has extraordinary intelligence and potential.
An orphan with no known family could be the main character. They discover they have a hidden bloodline through a series of events. It could be a bloodline that gives them the ability to see the past or future in dreams. This character would then be on a journey to figure out where they came from and what their power means, all while trying to fit into the ninja society.
Samui could be a great main character. She is a strong and intelligent kunoichi from the Hidden Cloud. Her skills in combat and her calm demeanor would make for an interesting story as she takes on various challenges within the village and outside.
Sasuke could be a great candidate. He has always been a bit of an enigma, with his brooding nature. He could be hiding a new power or a different side of his personality behind a mask, either self - imposed or as a result of some outside influence. Maybe he's trying to hide his true intentions from Naruto and the others as he pursues his own goals.
Yes, in many fanfictions, Naruto is often portrayed as a hidden genius. Writers like to explore the idea that he has untapped potential that goes beyond what was shown in the original series. This could include him having a deeper understanding of jutsu, strategy, or even having hidden powers.
His unique chakra. In some fanfictions, Naruto's chakra has special properties that make him a hidden genius. It could be more powerful or have a different quality than others, which gives him an edge in learning and using jutsu.
Another possibility is that it could be a reimagined version of Kakashi. He is known for his intelligence in the original series, but in this fanfiction, he could be even more of a silent genius. He might have some hidden knowledge or abilities that he keeps to himself and only reveals at crucial moments to turn the tide of battle or solve a major mystery within the Naruto world.
It could be a new character. For example, a young wizard from a far - off land who comes to Hogwarts specifically to find the hidden blade. He has his own set of skills and knowledge about the blade that no one else at Hogwarts has.
It could be a rogue ninja from another village who wants to use the demon within Naruto for his own evil purposes. He might be power - hungry and sees Naruto as a tool to gain control over the Hidden Leaf and other ninja villages.
It could be Orochimaru. He is always interested in new and powerful weapons. With Naruto having hidden blades, Orochimaru might see it as a threat and try to take the blades for himself, leading to a conflict.
It could be a rogue ninja who was once part of the same clan that the hidden blade belongs to. He wants the blade back to gain ultimate power and is willing to do anything to get it from Naruto.