He could have a 'Solar Sage Mode'. In this form, his body would be surrounded by a bright, sun - like aura. His physical abilities such as strength, speed, and agility would be enhanced to an extreme level. His attacks would also carry the power of the sun, like solar - powered punches or kicks that could cause massive damage.
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.
This new power could potentially make Naruto more self - reflective. He has always been a bit of a hot - head, but the power of the sun is so different from his normal chakra. He would need to take time to understand this new aspect of himself. It could lead to him being more in tune with his emotions and those of others. He might start to see the world in a different light, not just as a place to protect, but also as a place to nurture with his newfound power.
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.
I'm not sure specifically as there could be many interpretations. It might be about Naruto obtaining some kind of power related to the sun, like a new jutsu that harnesses solar energy or a transformation linked to the sun's power.
One possibility could be the power to control time. In fanfiction, this could be used in various ways, like going back to prevent tragedies or to gain more time to train. It would give Naruto a huge advantage in battles and in his quest to protect the village.
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.
One of the possible new abilities could be resurrection. Just as the phoenix is reborn from its ashes, Naruto might be able to bring himself or others back from the brink of death. This would not only be a game - changer in battles but also have a huge impact on the story. It would add a whole new level of drama and hope to the plot, as Naruto could potentially save his friends or even himself in the most dire situations.
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 the 'naruto power of the sun fanfiction', Naruto is the central figure. But other characters may also be significant. Shikamaru, with his strategic mind, could be involved in planning how Naruto can best utilize this power. Hinata might also be a main character as she has always been close to Naruto. Her support and unique abilities could be important in Naruto's journey with the power of the sun. And don't forget the Akatsuki members. They could be major antagonists in this fanfiction, trying to either stop Naruto from growing stronger with this power or use it for their own ends.