Jiraiya might also be a key character. As Naruto's mentor, he could be the one to guide Naruto on whether or not to explore the secrets of the alternate forbidden scroll. He has a lot of knowledge about the ninja world and its taboos, so his presence would be important in this kind of fanfiction.
Naruto is often a main character. Since he has a knack for getting into trouble and his determination to become stronger, he's likely to be involved with the Forbidden Scroll in some way. He might be the one who accidentally discovers it or has to protect it.
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.
Perhaps the fanfiction explores an alternate timeline where the contents of the forbidden scroll have a different impact on the ninja world. For example, it could lead to different alliances being formed. If a particular village gets hold of the scroll's secrets first, they might use it to gain an upper hand over others, and this could reshape the entire political and social structure of the Naruto universe.
Naruto is the primary one for sure. But there could be other characters like Jiraiya. Jiraiya is known for his knowledge of various things in the Naruto universe, and he could play a role in teaching Naruto about demon breeding. Additionally, some of the demon characters themselves could be considered main characters in a sense. They would have their own personalities and goals, and their interactions with Naruto would be a major part of the story. For example, a powerful demon that Naruto is trying to breed might have a complex backstory and motives that drive the plot.
In this fanfiction, Naruto is the key figure. However, characters like Shikamaru, who is known for his intelligence, might also be involved. He could be helping to plan Naruto's welcome or dealing with any potential issues that Naruto's return might bring. Also, Hinata, given her relationship with Naruto, would surely be part of the story. And the elders of the village may also play a role, as they often have a say in important matters regarding the village and its shinobi.
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.
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, Naruto would be one of the main characters. He's the one being betrayed. From RWBY, Ruby, Weiss, Blake, and Yang are likely to be involved. They are the central characters in RWBY, and if there's a betrayal of an outsider like Naruto, they would probably play a significant role in it.
The main character is Naruto for sure. When it comes to the Anbu, there could be some new and original Anbu characters created just for this fanfiction. They could have unique abilities and personalities. Naruto's relationship with these made - up Anbu characters could be really interesting. He might prank them in ways that play off of their individual quirks. For example, if one Anbu is really proud of his speed, Naruto could set up a prank that makes it seem like he's much slower than he thinks.
Naruto would probably be a central character. Given that he is the protagonist of the original series, in a fanfiction about the power of darkness, his reaction to this new and dangerous power would be crucial. Sasuke is also likely to be involved. His own struggle with power and his complex relationship with Naruto could be further explored in the context of the power of darkness. Kakashi, as a mentor figure, might play a role in guiding or trying to prevent the younger characters from being consumed by the power of darkness.