A really interesting plot twist could be that the source of Naruto's infinite chakra is tied to a prophecy that states he will either save the world or destroy it. This puts a lot of pressure on Naruto and makes the other characters question whether they should support him or not. And then, there could be a group of people who believe that the only way to ensure the world's safety is to kill Naruto before he can fully embrace his infinite chakra powers.
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.
One interesting plot twist could be a character who was thought to have no chakra - sensing ability suddenly developing it. This could completely change their role in the story and how they interact with others. For example, they might be able to sense a traitor among their group because of this new ability.
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.
One idea could be exploring how the chakra cloak affects Naruto's relationships. For example, his friends might be in awe or a bit intimidated at first. Another could be a story where Naruto has to control the chakra cloak in a completely new and challenging environment, like an alternate dimension with strange energy sources that interact with the cloak.
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.
A great plot twist could be that Lucoa is actually related to one of the tailed beasts in the Naruto world. Maybe she has some ancient connection that no one knew about. This would completely change the dynamics of their relationship and the story.
In some 'naruto batman fanfic', a plot twist could be that Naruto's chakra is somehow linked to the power source of Batman's technology. So when Naruto is in danger, it affects Batman's gadgets. This unexpected connection changes the way they fight together and adds a new layer of complexity to their relationship.
A plot twist could be that Naruto himself is revealed to have a connection to the Force all along. Maybe his strong willpower and ability to never give up is actually a manifestation of the Force in a different form. This would completely change the dynamic of how he interacts with the Jedi concepts.
One interesting plot twist could be Kurama suddenly losing his power. In the fanfic, this might force Naruto to find a new way to fight, relying more on his own ninja skills and the relationships he has built with his friends. Another could be Kurama being controlled by an unknown enemy, and Naruto has to find a way to break the control without harming Kurama. It changes their dynamic from partners to Naruto being the rescuer.
A plot twist might be that Orochimaru discovers a hidden power within Naruto that is related to the snake sage's powers. This could lead to an unexpected alliance where Orochimaru wants to explore and use this power, but Naruto uses it to his advantage to try and reform Orochimaru. They end up on a journey together to unlock the secrets of this power.
One interesting plot twist could be a character who was thought to be dead actually being alive and having a secret plan all along. For example, in some fanfics, Itachi might not really be dead and his actions were all part of a greater scheme to protect the village in a different way.