Obviously Naruto himself is a main character as it's about him as Hokage. Sakura also often plays a significant role. She might be the one providing medical support during Naruto's adventures or helping him with some political decisions in the village.
There are also often new characters created specifically for these fanfictions. They could be a young ninja who looks up to Naruto as a mentor. This new character might have a special ability that Naruto has to help develop while also learning from the young ninja's fresh perspective on the ninja world.
Sasuke is usually there too. He could be Naruto's partner in dealing with external threats. Their relationship as friends - turned - rivals - turned - friends again is often explored further in these fanfictions. For example, they might team up to fight a new organization that aims to destroy the Hidden Leaf.
Obviously Naruto himself is a main character. He is on the road to becoming Hokage, so the story usually revolves around him.
Sasuke is also frequently featured. His relationship with Naruto, whether it's as a rival or a partner in protecting the village, adds a lot of depth to the stories. In some fanfictions, Sasuke might play a crucial role in helping Naruto deal with threats to the village from the shadows.
Obviously, Naruto himself is a central character as it's about him as the Hokage. Sasuke is also very popular as his former rival and now an ally. Sakura is often included too, as one of Naruto's closest friends. Kakashi, being Naruto's former teacher, is also a frequently seen character. Hinata, Naruto's wife, may also play important roles in these fanfictions.
Another character could be Kakashi. Fanfiction might depict him as having a secret hero identity where he has a special jutsu or ability that he has never revealed. He could use this to fight against a new and powerful enemy that threatens the village, all while maintaining his cool and mysterious demeanor.
Often, Kakashi Hatake is a main character as he has a history with the Anbu. His skills and experiences make him a great fit for Anbu - related fanfiction stories.
Well, Naruto is surely one of the main characters since it's in the title. And it's likely that the current or past Hokages could also be important characters, as Naruto is a secret fan of the Hokage. There might also be Naruto's friends like Sasuke and Sakura, who could be involved in the story, perhaps not fully aware of Naruto's secret.
One of the most popular Hokages in these fanfictions is the Fourth Hokage, Minato Namikaze. Since he is Naruto's father, there's a natural connection. Minato can train Naruto in his unique space - time ninjutsu and share his experiences as a Hokage. Another is the Third Hokage, Hiruzen Sarutobi. He has a wealth of knowledge and can teach Naruto about the history and traditions of the village. Also, the Sixth Hokage, Kakashi Hatake, is often featured. Kakashi can train Naruto in his own combat style and also in how to handle the responsibilities of being a leader.
Yang Xiao Long, who is related to the Branwen family, can also be a main character in these fanfictions. She could meet Naruto and they could have some really fun adventures together. Maybe they compete in some sort of fighting tournament that combines the fighting styles of both universes.
Obviously Naruto is a main character in most Naruto Saint fanfiction. He is usually the one who gets involved with the saint - like elements. Another character could be Sasuke. Sometimes in these fanfictions, Sasuke might be jealous of Naruto's new saint - related powers.
Well, obviously Chronoa herself is a main character. Naruto is also often included as he is the central figure in the Naruto series. They might interact in ways that change the course of the Naruto story. For instance, Chronoa could help Naruto unlock new forms or powers related to time.