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.
Sakura is another character that can be popular in 'naruto new power fanfiction'. She might be given enhanced medical ninjutsu abilities, or even some combat - related powers that were not as prominent in the original series. For example, she could have the power to heal fatal wounds instantly or use her chakra to create powerful force fields.
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 new power fanfiction', one interesting concept could be new jutsu. For example, a fanfic might introduce a jutsu that combines different elements in a unique way, like a lightning - fire combo that creates a powerful plasma - like attack. Another concept could be new forms of chakra control, perhaps a way to use chakra to manipulate time on a small scale.
It could be that he discovers the new power while exploring an ancient and mysterious place. There might be some kind of energy source or relic in that place that unlocks the power within him. He might have to solve some puzzles or overcome some trials to fully access the power.
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.
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.
Naruto would adapt to Obito's Sharingan by relying on his strong will and his existing combat experience. He's faced many challenges before, and this would be just another one. He'd probably train with Kakashi or Sasuke to understand the Sharingan better. Since he has such a large amount of chakra, he might be able to use the Sharingan's power more frequently than others. He would also try to incorporate it into his existing fighting style, for example, using it to enhance his Rasengan or his taijutsu.
He would likely become more responsible. Since he has such a powerful ability, he knows he has to use it for the good of the village. He may start to take on more leadership roles, as he can now analyze situations more thoroughly in the frozen time. He'll also become more empathetic as he can use the time - stopping to understand his friends' and enemies' situations better. For instance, he could stop time to study an enemy's past and find out what made them the way they are, and then try to help them instead of just fighting.
Some would be in awe. The villages that Naruto has helped in the past would likely see it as another sign of his strength and a great asset. For example, the Hidden Leaf Village would feel even more protected. However, the other villages that have been enemies or rivals in the past might see it as a threat and start to plot against Naruto and the Leaf Village.