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.
It also depicts his growth in terms of his chakra control. In fanfiction, Naruto could gain the ability to split his chakra into multiple clones without any limit. These clones would not be the normal shadow clones but more like independent entities with their own thoughts and powers, which he can control simultaneously. This would make him an extremely formidable opponent. Another way is that his chakra becomes so pure that it can heal any injury, not just physical but also mental and spiritual ones. This new aspect of his power would change the dynamics of his battles and relationships with other characters.
If the power stone gives Naruto access to a great amount of knowledge, it could make him more mature. He would understand the deeper workings of the ninja world and the history behind the conflicts. This new - found knowledge could also make him more diplomatic, as he would see the bigger picture. For example, he might be able to negotiate better treaties between the villages. He would no longer be just the brash young ninja but a more well - rounded leader with the help of the power stone.
Some fanfictions might feature new or original characters as the ones who absorb Naruto's power. These characters could be created specifically for the fanfiction to explore unique storylines. For example, a mysterious outsider who arrives in the Naruto world and has the ability to absorb powers. They target Naruto because of his reputation as a powerful ninja. They may not understand the full implications of absorbing his power and end up causing chaos in the process.
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.
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.
Perhaps it's an ancient artifact with power. It could be a weapon like a sword or a staff that has been enchanted with some sort of magic. This power could enhance Naruto's physical abilities and give him an edge in battles. When he wields it, he might be able to access special techniques related to the artifact.