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.
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 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.
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.
One possible plot twist could be that his heritage is linked to an enemy he thought was unrelated. So he has to reevaluate his views on the whole conflict.
When Naruto finally realizes the sacrifices his father made for the village and for him. For example, learning that his father sealed the Nine - Tails inside him to save the village at the cost of his own life. This realization can be a very emotional moment as Naruto understands the depth of his father's love and selflessness.
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.