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.
Jiraiya is another likely character. He was Minato's teacher. So, he could share stories about Minato's training days, like how hard Minato worked to master his skills. Jiraiya might also tell Naruto about his father's dreams and ambitions for the village.
Marinette might also play a role. Even though she doesn't have direct knowledge of Adrien's family at first, she is very observant. She could notice something odd about Adrien's behavior when he starts to search for his father's wish and offer her help. Together, they could piece together the mystery from different clues around the city.
In many fanfictions, it could be through finding old documents or letters. Maybe he stumbles upon a hidden scroll in his home that contains some information about his father. For example, it might be a letter from his father to his mother that gives some clues about his father's personality or his role in the village before Naruto was born.
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.
Well, in many such fanfictions, Naruto might start learning his father's jutsu when he discovers some hidden scrolls or when a mentor who knew his father decides to teach him. Maybe it could be someone like Jiraiya who reveals some secrets about his father's techniques.
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.
There could be some original Asian - inspired characters. For example, a young martial artist from a small village in China who Naruto takes under his wing. This character could be eager to learn from Naruto and would be one of the main focuses as he grows under Naruto's guidance.
One challenge could be the complexity of the jutsu itself. His father's jutsu might be very advanced and require a high level of chakra control that Naruto doesn't initially have.
Well, in some versions of the fanfiction, Naruto might use his newfound powerful jutsu. Maybe he masters a time - travel jutsu and goes back to the moment before his father's death to change the outcome.
One great fanfiction in this theme could be 'The Bond of Uzumaki'. It focuses on Naruto teaching his daughter ninjutsu skills. The story beautifully shows their father - daughter relationship, with Naruto being patient and protective. It also has some cool action scenes where the daughter shows her potential, making it an interesting read for Naruto fans.
Sakura could be there. As Naruto's friend, she might be the child's doctor, always ready to heal any injuries. She could also give parenting advice to Naruto based on her medical knowledge.