One possible mysterious power in Naruto fanfiction could be the ability to control time. In fan-made stories, a character might discover they can slow down or even reverse time, which would give them a huge advantage in battles. They could use it to avoid attacks or heal wounds that have already been inflicted. This power would also add a whole new layer of complexity to the plot as it could disrupt the normal flow of events and relationships in the Naruto universe.
In some fanfictions, Naruto's hidden power could be the ability to control a powerful and ancient force. For example, he might be able to harness the power of some long - forgotten bijuu or a mysterious energy that was sealed away in the past. This would give him abilities that are on a completely different level compared to his normal skills.
In Naruto fanfiction, one common power - up is related to new jutsu creation. For example, some fanfictions might have Naruto develop a jutsu that combines the power of all five chakra natures in a completely unique way. This could give him an edge over his enemies like never before. Another aspect could be the enhancement of his Sage Mode. Maybe he finds a way to make it more stable and powerful, allowing him to stay in the mode for a much longer time without any negative side effects. There are also fanfictions where Naruto gains the ability to control time, which is a completely new and overpowered concept that makes for really interesting stories.
Well, in some fanfictions, it could be during a life - or - death battle. Maybe when he's facing an extremely powerful enemy that he can't defeat with his known abilities. His friends could be in great danger, and that intense situation triggers the revelation of his hidden power.
His hidden powers might be the ability to control all five basic nature types without any training. In the original story, Naruto had to work hard to master different nature types. But in a fanfiction, it could be that he has this innate ability which was hidden all along. This would make him extremely powerful and feared by his enemies.
Naruto himself is obviously a very popular character in such fanfictions. Since the stories often revolve around his hidden powers. Sasuke is also commonly involved as his rival. Their relationship and the contrast between Naruto's newfound hidden power and Sasuke's own abilities make for interesting storylines. Sakura can also be a key character, maybe she plays a role in helping Naruto discover or control his hidden power. Kakashi too, as Naruto's former teacher, could be involved in guiding Naruto in understanding and using this hidden power.
Some interesting plot ideas in naruto hidden power fanfiction might include Naruto finding out he has a hidden power that lets him see the past and future of the ninja world. This could help him prevent disasters or find lost secrets. Another idea is that his hidden power is related to chakra absorption and manipulation in a unique way. He could absorb the chakra of his opponents and use it to enhance his own abilities or heal himself. Also, perhaps Naruto has a hidden power that is linked to the spirit world, allowing him to call upon the help of deceased ninja or gain spiritual guidance.
In certain fanfic concepts, Naruto could get the phoenix power during a near - death experience. His strong will to survive and protect his friends could attract the phoenix spirit. The phoenix, known for its rebirth and powerful abilities, might choose Naruto as its host, seeing his indomitable spirit as a worthy vessel for its power.
Well, it could be that Naruto's strong will and his connection to all the other tailed beasts play a role. Since he has befriended the other tailed beasts, their combined energy or some sort of spiritual link might attract the power of the Juubi. For example, in some fanfic concepts, the tailed beasts' collective consciousness decides to merge their powers with Naruto, which includes the Juubi's power as the ultimate form of chakra.
In a fanfiction, Naruto having the power of the sun could potentially have a huge impact on the chakra system. Since the sun is such a powerful energy source, it might disrupt or enhance the existing chakra flow. He could develop new jutsu that are based on solar energy rather than just the normal chakra types. This could lead to a whole new set of skills and abilities that are unique to him, and it would force his opponents to completely re - evaluate their strategies when facing him.