Well, in some fanfictions, white chakra could be a symbol of a purer or more enhanced form of Naruto's power. It might represent a new level of spiritual or physical strength that sets him apart from his normal state. It could also be related to some sort of special heritage or a connection to a mysterious force that only he can access.
Well, it could be that Naruto discovers an ancient artifact that contains Hashirama's chakra. When he touches it or unlocks its power in some way, the chakra gets transferred to him. For example, the artifact might be hidden in a secret location and Naruto stumbles upon it during one of his adventures.
If Naruto had no chakra in fanfiction, the story would be completely different. He couldn't use jutsus like the Shadow Clone Jutsu which was so crucial in his development. His journey to become Hokage would have to rely on other aspects like his physical strength and strategic thinking. He might train in different martial arts forms or focus more on weaponry. Maybe he'd become an expert in stealth and espionage without relying on chakra - based techniques for infiltration.
One possible storyline could be that Naruto struggles to control this dark chakra. He might accidentally harm his friends and then have to go on a journey to find a way to suppress or purify it. For example, he could seek out ancient jutsu or visit reclusive sages.
In such a fanfiction, Naruto would be extremely powerful. He could spam his powerful jutsus without getting tired. For example, he could keep using Rasengan continuously in battles, overwhelming his opponents. His Shadow Clone Jutsu would be even more fearsome as he wouldn't have to worry about chakra depletion when creating a large number of clones.
He might gain the ability to control wood - style jutsu more effectively. Since Hashirama was known for his powerful wood - style, Naruto could use it to create huge forests for defense or to trap enemies. For instance, he could grow trees instantly to block incoming attacks.
Well, in such a fanfiction, Naruto might start to experiment with new and extremely powerful jutsus that were previously impossible due to chakra limitations. He could also use his infinite chakra to help rebuild and improve the Hidden Leaf Village at a much faster rate. For example, he could power large - scale construction projects or provide continuous chakra for defense mechanisms. This would change the balance of power not only in the Leaf but also among the other hidden villages.
Naruto would likely become more confident. With infinite chakra, he would no longer have the insecurities related to running out of chakra during battles. This new - found power could also make him a bit more reckless at times, as he might think he can handle any situation without consequences.
One interesting concept could be a character unlocking the hidden potential of the chakra gates in a unique way. For example, they might discover a new sequence of opening the gates that gives them powers beyond what was thought possible in the original Naruto lore.
One consequence could be that he becomes extremely powerful. His physical abilities like strength, speed, and endurance are enhanced. He can also use more powerful jutsus with the extra chakra boost from the Kyuubi.