One interesting plot twist could be that Naruto's infinite chakra attracts the attention of powerful, ancient entities who want to either control or destroy him because they see his power as a threat. Another could be that Naruto's friends start to feel inferior and jealous of his unlimited power, causing a rift in their relationships.
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.
Well, with infinite chakra, Naruto can spam his powerful jutsus without getting tired. For example, he could keep using Rasengan continuously. This would make him almost unbeatable in battles, changing the power dynamics in the story completely.
In Naruto fanfic, chakra theory can be explored in many ways. For example, some fanfics might focus on a character developing a new type of chakra control or a unique chakra nature. It could be about a character who discovers an ancient chakra technique that was lost in the main Naruto storyline. Fanfic authors often take creative liberties with chakra theory to make their stories more interesting.
It could be a jealous ninja from another village who sees Naruto's infinite chakra as a threat to their own village's power. This ninja might try to steal Naruto's chakra source or find a way to nullify it.
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.
One idea could be that Naruto uses his infinite chakra to instantly master all the jutsus in the ninja world. He could then teach others, changing the power dynamics in the Hidden Villages.
In Naruto fanfic, a 'chakra gun' could be a creative interpretation. It might be a weapon that utilizes chakra in a unique way, perhaps concentrating and projecting it like a gun. It could be a device created by a fanfic author to add an interesting and new combat element to the Naruto universe.
In Naruto fanfic, chakra chains can be portrayed in various ways. Some authors might make them stronger or more versatile than in the original series. For example, they could be used to bind not just physical objects but also chakra itself. It adds an interesting twist to battles and character abilities.