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 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.
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.
Obviously, Natsu himself would be one of the main characters. His parents, whose identities are likely to be revealed in the fanfiction. There could also be his friends, like Lucy, Gray and Erza. They might be there to support Natsu during this emotional encounter or play a role in helping him find his parents.
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.
In this fanfiction, Naruto, filled with new - found strength and determination, jumps in front of his parents. His parents, who have long been dead, look at him in shock and pride. Naruto stands tall, his eyes blazing with the will of fire. He tells them that he has come a long way, that he has faced countless enemies and hardships. He wants them to know that he is no longer the lonely, ostracized boy. His father, Minato, smiles and places a hand on Naruto's head, just as he did when Naruto was a baby. His mother, Kushina, hugs him tightly, her eyes wet with tears. Naruto then begins to tell them about his friends, his village, and how he has protected it all. He vows to continue to do so, with their love and support always in his heart.
One possible story could be that Naruto discovers his unique bloodline abilities later in life and realizes that his parents' neglect was partly due to fearing his power. He then has to come to terms with this and learn to control his abilities on his own.
In such fanfiction, Naruto might withdraw from his friends and become more isolated as he processes this newfound knowledge in a negative way.