Sakura could also be a supporting character. She could be there for Naruto as a friend, listening to him talk about his new discoveries. She might also help Naruto research more about his parents, using her intelligence and medical knowledge. For example, she could look into any medical records related to Kushina's pregnancy or Minato's health, which could lead to more revelations about Naruto's family history.
Iruka could be a main supporting character. He has always been like a father figure to Naruto in a way. He could help Naruto process the new information about his real parents, providing emotional support and also sharing his own memories of Naruto growing up, which could contrast with the new knowledge about Minato and Kushina.
The Third Hokage, Hiruzen Sarutobi, would be a very important character. He was around when Naruto's parents were alive. He could have hidden records or memories that he might share with Naruto. Another possibility is Jiraiya. He was Minato's teacher and Naruto's godfather. He would have a wealth of knowledge about Minato and Kushina, and he could be a key figure in helping Naruto learn about his parents.
Obviously, Naruto himself is a key character as the story is about him learning his heritage. His mentor, like Kakashi, could also play an important role. Kakashi might notice some strange things about Naruto's abilities and start to suspect that there's more to his heritage. Then he could guide Naruto in the discovery process.
Iruka could be one. He's always been like a mentor to Naruto. He might have some knowledge about Minato that he shares with Naruto. For example, he could tell Naruto about his father's kindness towards students at the ninja academy.
Another plot point could be Naruto meeting an old acquaintance of his parents. This person could share stories about how his parents met, their early days together, and the kind of people they were. For example, they might talk about how Kushina was a feisty and strong - willed woman, and how Minato was a prodigy with a kind heart. This would help Naruto see his parents as real people with their own personalities and not just as the heroes who sacrificed themselves for the village.
Well, there could be characters like Iruka - sensei. Since Naruto has been forgotten by his parents, Iruka might play an even more important role in Naruto's life, becoming like a surrogate father figure. Another character could be Sasuke. Sasuke, who also has his own family issues, might either be a source of understanding for Naruto or a contrast to his situation.
Well, obviously Naruto himself is a main character. He is the protagonist of the Naruto series and the focus of the fanfiction in relation to his parents. Then there are his parents, Minato Namikaze, the Fourth Hokage, and Kushina Uzumaki. They play important roles in Naruto's life in the fanfiction, whether it's through memories, flashbacks, or even being brought back to life in some stories.
In many fanfictions, Naruto might start to discover information about his parents through a chance encounter. For example, he could find an old scroll or meet someone who knew his parents. Maybe he stumbles upon a hidden room in the Hokage's office that has some clues about his father, Minato. It could also be that an older ninja decides it's time to tell Naruto the truth after seeing his growth and determination.
The main characters are obviously Naruto, Minato (his father), and Kushina (his mother). Naruto is the protagonist whose life is greatly affected by knowing his parents. Minato, the Fourth Hokage, brings his powerful jutsu knowledge and leadership experience. Kushina, with her unique Uzumaki abilities and strong personality, also plays a crucial role.
Maybe some new characters from the demigod side could also be main characters. For example, a demigod like Percy Jackson could be introduced to the Hogwarts world. And of course, Dumbledore would also play an important role as he guides the students in Hogwarts and would be involved in any new discovery like learning about demigods.
Sakura is often a common supporting character. She can use her medical skills to support Naruto and the village, and also offer him emotional support. Another is Kakashi. He has been Naruto's mentor for a long time and can offer his wisdom on being a leader.