Well, it's possible that some new or less - known characters from the Naruto universe could become main characters in 'chaos naruto fanfiction'. For example, Rock Lee could take on a more central role. He has always been a character full of determination and unique fighting style. In a chaotic setting, his strong will could be a key factor in dealing with the chaos. And then there are the jinchuriki of the other tailed beasts who might be more prominently featured as they are all related to the power dynamics in the Naruto world which could be thrown into chaos.
Well, aside from Naruto's usual comrades, there could be new characters introduced. Maybe some ancient sages or demons who are either attracted to Naruto's new chaotic status or are trying to take advantage of it. And of course, the kages of the different villages would play significant roles as they would be directly affected by Naruto's actions as the 'god of chaos'.
Sasuke would also likely be involved. Given their long - standing relationship and rivalry in the original series, Sasuke would surely have an opinion on Naruto's connection to the Chaos God. He might either try to help Naruto control this new power or try to take it for himself, depending on how the story is written.
Obviously, Percy would be one of the main characters. Chaos, who raises him, would also be very important. There might also be some other primordial beings that interact with Percy during his upbringing.
Obviously, Percy would be one of the main characters. And then there's Chaos. Depending on the writer, other characters from Percy's world like Annabeth or Grover might also make an appearance, perhaps coming to find Percy in the chaos - filled realm.
Obviously Percy is one of the main characters. There might also be the leaders of the chaos army. They could be some powerful and mysterious figures that Percy has to interact with. And perhaps some of Percy's old friends might also play a role, either trying to bring him back or having to face him as an enemy now.
There could also be new characters introduced. Maybe a business rival who is jealous of Naruto's success. This rival could be from another village or even an outsider who has his own motives for trying to take down Naruto's billion - dollar empire. And of course, the Hokage would still play a role, as Naruto's actions as a billionaire would have an impact on the village's politics and power structure.
Definitely Naruto himself. He'd be a central character, causing chaos and bringing energy to the daycare. And Sasuke would also be there, probably being a bit of an aloof kid that Naruto is determined to get close to.
Obviously, Naruto would be one of the main characters. Since it's a Naruto - centered fanfiction with the beyonder element added. Sasuke could also be a main character as he is often Naruto's counterpart and rival. They might both be involved in exploring the beyonder powers. Additionally, characters like Kakashi could play important roles. He could be the one guiding Naruto and Sasuke in understanding these new and strange beyonder powers, given his experience and wisdom.
Other Naruto characters like Sasuke or Sakura might also be important. Sasuke could be involved in Naruto's new role as a 'guardian' either as a supporter or a skeptic. Sakura, with her medical skills, could play a role in helping Naruto in his 'guardian' - related adventures, perhaps by healing those affected by new threats that come with the combination of the two universes.
Besides Naruto and Sasuke, Sakura could also be a main character in such fanfiction. Her medical ninjutsu skills might be needed to heal the wounded during the battles against Galactus. And there could be some original characters created specifically for the fanfiction who have some special knowledge or power related to Galactus and the Naruto world.