I'm not sure specifically as it's a fanfic, but it could include Naruto himself. He might have a special connection to the chakra paper in this story.
It's possible that new characters are introduced in the 'naruto chakra paper fanfic'. Maybe there's a young ninja who discovers a unique property of the chakra paper and becomes central to the story. However, it could also have the regular Naruto characters like Sasuke and Sakura involved in a new plot related to the chakra paper.
It really depends on the specific fanfic. But it could be Naruto himself, as he often has new abilities or storylines in fanfics. He might be the one to master the chakra chains in a unique way.
I'm not sure specifically who the main characters are in this fanfic without reading it. But it could be new characters that are introduced because of this special chakra concept, or it might focus on existing Naruto characters like Naruto himself or Sasuke, and how they interact with the special chakra.
It really depends on the specific fanfic. But it could be Naruto himself, as he's the central character in the original series. He might be the one to discover or interact with the chakra fruit in some significant way.
Sasuke could also be a main character in such a fanfic. Maybe he is initially jealous of Naruto getting the chakra armor and there could be a rivalry between them as they both try to master the power it offers. And Sakura might also be involved, perhaps as the one who helps heal the wearer of the armor when they get injured during battles or training.
It depends on the specific fanfic. However, it could be Naruto himself, exploring new aspects of his relationship with nature chakra. Or perhaps a new character created by the fanfic author who has a special connection to nature chakra. Another possibility is Sasuke, as he could also be delving into the mysteries of nature chakra in the fanfic.
Often, Naruto himself would be a main character as he has a strong connection to chakra in general. He might be exploring and mastering the rikudou chakra in the fanfic.
Well, it might be that the chakra paper in this fanfic has different reactions to different types of chakra that we haven't seen in the main series. For example, it could change color based on the purity of the chakra, which could lead to new ways of categorizing ninja abilities.
It's hard to say for sure without reading it. But if it follows the Naruto pattern, Naruto himself could be one of the main characters. He's often at the center of things in Naruto - related stories.
Sasuke could also be a main character. His Sharingan abilities could play a role in detecting or fighting the chakra monsters. Maybe he teams up with Naruto again to deal with this new threat.
Since it's fanfiction, the main characters could be the usual Naruto favorites like Naruto himself, Sasuke, or Sakura. But it could also introduce new characters created by the fanfiction author who play important roles related to chakra.