It's possible that the main characters include some reformed villains from the original Naruto series. In this new age fanfic, they could be trying to redeem themselves. Or perhaps it's a group of outcast ninjas who are trying to prove themselves in a world that has become more competitive and complex in this new age of the Naruto story.
I don't know for sure since I haven't read this specific fanfic, but it could be characters like Gaara. Given his connection to sand, he would be a likely candidate if the fanfic focuses on iron sand.
It could still be Naruto himself. Since he's the central character in the original series, many fanfics would likely continue to build on his story.
Most likely Naruto would still be a main character. Since it's a Naruto fanfic, he's probably at the center of the story. His friends like Sasuke, Sakura, and Kakashi might also be important characters. There could also be new characters created specifically for this fanfic that interact with the existing ones.
It's hard to say for sure without reading it, but likely there will be three main characters who are the new sannin. They could be students of the original sannin or completely new characters with no direct connection but similar in their skills and importance.
Naruto is surely one of the main characters. After all, it's a Naruto fanfic.
I don't know as I haven't read the novel. But it could have a young and ambitious summoner as a main character.
Obviously, the new Hokage would be one of the main characters. It could be a character we already know like Naruto's son, who has inherited his father's determination and strength.
Typically, the main characters would be those from the Dragon Age Trinity. They might include powerful mages, skilled warriors, and cunning rogues. Each character would have their own unique abilities and personalities that drive the story forward.
I'm not sure specifically what 'naruto the new age fanfic' is about as there could be many different interpretations. It might be a fan - made story set in the Naruto universe in a new era, perhaps with new characters, new jutsu, or different plotlines that deviate from the original Naruto story.
Naruto's family members like Hinata and his children are often main characters. Hinata has been his wife, and in old age stories, she would be there supporting him. His children would be learning from him, and their growth and relationship with their aging father can be a major plot point in these fanfictions.