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, fem Naruto herself is a main character. Her father, Minato Namikaze, and her mother, Kushina Uzumaki, are the ones she is going to meet. There might also be other characters from the Naruto universe like Jiraiya, who was Minato's teacher and could potentially be involved in the story, perhaps as someone who helps facilitate the meeting.
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.
Iruka could play a role. He was Naruto's first teacher who believed in him. He might have some small piece of information that starts Naruto on his journey to find his parents. Then there's Tsunade. As the Hokage, she has access to a lot of secret files. She could either be an obstacle, not wanting Naruto to dig too deep, or she could be a helper, providing him with crucial information. And of course, the Nine - Tailed Fox. It was sealed inside Naruto by his father, so it might have some memories or knowledge related to Naruto's parents that it could share with Naruto.
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.
In the 'Banished Naruto's Parents Revealed Fanfiction', his parents could be presented as having been part of a group that was at odds with the village leadership. Maybe they were trying to bring about some kind of change that the elders didn't like. So, when Naruto was born, they were seen as a threat, and Naruto was made to suffer as a result. This would be a departure from the more heroic and straightforward view of them in the original series.
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.
One aspect could be that the fanfiction shows Naruto's heartbreak in a very visual and emotional way. For example, he might see his parents in a dream - like state and then they disappear, leaving him feeling more alone than ever. It's a way to dig deeper into his character's vulnerability, which was somewhat masked in the original series by his determination.
Emotionally, Naruto would have to deal with a whole new set of family relationships. He grew up without his parents, and now having them back would be a huge adjustment. He might struggle to fit into a 'normal' family dynamic, and there could be some friction as they all get to know each other again.
In some fanfictions, Naruto might find a super - powerful jutsu or artifact. For example, he could discover a long - lost forbidden jutsu that has the power to bring the dead back to life. Or perhaps he stumbles upon a magical item during one of his adventures that is said to be able to revive the deceased.
On a personal level, Naruto would finally get the family he always wanted. But it might also bring some confusion and adjustment issues. His parents would be from a different time, and they'd need to adapt to the new world Naruto lives in. For example, they might be shocked by the new technology and the changes in ninja warfare.