The special power could be the ability to communicate with all living things. Naruto is already known for his connection with the Nine - Tails. With this new power, he could understand the thoughts and feelings of animals, plants, and even other ninja. This would give him an edge in gathering intelligence, finding hidden places, and forming unexpected alliances.
If Naruto has a special power, it might make some of his friends a bit jealous at first. For example, Sasuke might feel that Naruto is getting too far ahead. But over time, they would learn to work together again. His relationship with Sakura could also change. She might see Naruto in a new light and be more in awe of him. And his enemies would start to fear him more, which could lead to some trying to find ways to steal his power or defeat him in more underhanded ways.
It could be the main character Naruto in some fanfics. Since he already has a connection with the Nine - Tailed Fox, a fanfic writer might expand on that and give him an even more powerful 'Power of the Beast' that combines the Nine - Tailed Fox's power with other beast - like elements.
If Naruto has the power of chaos in a fanfic, it would likely change his relationships. His friends might be both in awe and a bit scared of his new power. He could use this power to break free from some of the traditional ninja constraints. Maybe he could create new jutsus that are based on chaos, like a chaotic shadow clone technique that doesn't follow the normal rules of clone behavior.
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.
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.
Well, in Naruto fanfic, the 'Power of the Beast' may be a newly - created power concept. Maybe it's a power that combines the strength, speed, and instincts of different beasts. For example, it could be a power that allows a character to have the agility of a cat - like beast, the strength of a bear - like beast, and the senses of a wolf - like beast all at once. It could also be a power that is awakened through some special ritual or training related to beasts.
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.