Naruto himself is obviously a main character in these fanfics. His memories are the central focus after all.
Iruka Sensei might also be a main character in 'naruto memories fanfic'. He was one of the first people to believe in Naruto in the original story, so his presence in Naruto's memories could be explored in depth in fanfics, like how Naruto remembers Iruka's kindness and support during his difficult childhood.
Sasuke can also be a main character in some fanfics. For example, there could be a story where Sasuke finally comes back to the village and Naruto takes him to Ichiraku to have some ramen as a way of welcoming him back. Kakashi might also make an appearance in such fanfics, as he is Naruto's teacher and might join them for a bowl of ramen.
Some fanfics might also feature Naruto himself interacting with a Ryugan user. Naruto could be curious about this new and mysterious eye - power, and they could end up becoming friends or allies.
In some 'naruto yoton fanfic', there are original characters created specifically for the story who possess the Yoton power. These characters interact with Naruto and the other well - known Naruto characters. They could be from a long - lost ninja clan that has been hiding their Yoton abilities and now come out into the open due to certain events in the fanfic's plot.
In 'naruto roar fanfic', Naruto is the central figure for sure. But characters like Jiraiya could also be prominent. Jiraiya was Naruto's mentor and his presence in a fanfic could add a lot of depth, especially when Naruto roars in a moment of remembrance of his teachings. Then there are the other members of the Akatsuki who could be antagonists in these stories, like Itachi or Deidara, which would lead to some great conflict and reasons for Naruto to roar.
Some fanfics might feature original characters. For instance, a young samurai from the Land of Iron who dreams of becoming a great warrior and befriends a ninja from Konoha. This samurai could be the main focus, showing his growth and how he bridges the gap between the samurai and ninja worlds.
Sasuke could also be a main character. Picture him being drawn to the power of the bo staff, and using his skills to master it. He might face off against other powerful ninjas who also covet the bo staff.
Sasuke could also be a main character. His pursuit of power and his unique abilities could lead him to cross paths with the Zero Tails. Maybe he wants to use its power for his own goals, like avenging his clan or changing the ninja world in his vision.
Some fanfics might introduce new original characters that are related to the toad sage lore. They could be other toad-like beings or humans who have a special connection to the toad sages. These new characters could add new twists and turns to the story, such as having a secret power that Naruto needs to unlock in order to reach a new level as a toad sage.
Naruto himself is obviously a main character. His high IQ in these fanfics allows him to take on new challenges and roles. For example, he might be a strategic mastermind instead of just a powerful fighter.
The main characters in 'batman 1939 fanfic' are likely to be the core elements of the Batman universe in 1939. Batman, with his cape and cowl, is the hero. The villains like the Penguin, who was also one of the early villains, could be prominently featured. And Vicki Vale, a journalist who was involved in Batman's early storylines, might also be one of the main characters in the fanfic, as she added a different dimension to the stories with her investigations and her relationship with Batman.