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.
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'.
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.
Obviously Naruto himself is the central character as it's about his hibernation. His friends like Sasuke and Sakura are also likely to be involved. They would probably be the ones most concerned about his condition and try to figure out what happened.
Hinata would also play a major role. Since she has deep feelings for Naruto, she would be devastated by his amnesia. She might try to use their shared memories, like the time she confessed her love to him during the Pain attack, to jog his memory. And the Akatsuki members could also be involved in some cases. If Naruto's amnesia was caused by their actions, they might be the antagonists in the fanfiction, or they could also be trying to use his amnesia for their own purposes.
In a 'naruto chronal accelerator fanfiction', Naruto is almost certain to be involved as he is the heart of the Naruto story. However, other characters like Sakura could also play a major role. She might use the chronal accelerator to go back and improve her skills at an earlier time. Additionally, Orochimaru might be interested in the chronal accelerator for his own devious purposes, like trying to gain more power by changing the past or finding new ways to experiment with his immortality.
Kakashi could be involved as well. As Naruto's mentor, he would likely be concerned about Naruto's well - being and how he is handling the fusion. He might try to guide Naruto in controlling the power and also protect him from those who would seek to take advantage of his new - found strength.
Sakura would probably be there too. She might be the one to find Naruto when he's shrunken and in trouble. And Kakashi Sensei, he could play a role in training Naruto to control his shrinking ability or using it in battle strategies.
Kakashi could also be an important character. He has a lot of experience and wisdom. When Naruto gets high, Kakashi might be the one to guide Naruto through this strange state, using his own past experiences and knowledge of different ninja techniques. And then there's Jiraiya. Given his relationship with Naruto, he would surely be involved, perhaps trying to use his own unique jutsu to help Naruto come back to normal.
The other Konoha 11 members would likely be involved too. They might be split in their opinions. Some would firmly stand by Naruto, while others might be swayed by the village's reasons for denying him. Hinata, for instance, would probably be one of Naruto's biggest supporters and might even try to fight against the decision in her own way.
Well, obviously Naruto and Sasuke are the main ones. Since it's about Naruto absorbing Sasuke, their relationship is at the core. But also, characters like Kakashi could be involved. He might be the one guiding Naruto on how to control his new powers or trying to understand the implications of this strange occurrence.