It could show them feeling proud of Naruto's achievements. For example, when Naruto becomes Hokage, they might be seen with tears of joy in the fanfic.
Perhaps they return to impart some final wisdom to Naruto. Minato could teach Naruto some advanced sealing techniques that he hadn't mastered yet, and Kushina could share more about the Uzumaki clan's secrets and how Naruto can further harness his Uzumaki heritage.
Well, it could involve Naruto having god - like powers and his relationship with his mother Kushina. Maybe he uses his powers to protect the village in a way that Kushina would be proud of. For example, he could effortlessly defeat powerful enemies that threaten Konoha.
There's a fanfic called 'Minato's Return'. In this story, Minato somehow returns and gets to see Naruto's growth. It's really interesting to see how he interacts with Kushina, who is also there in the story, and how they both guide Naruto in new ways. The descriptions of their family bond are heartwarming.
One possible plot could be that with Minato and Kushina alive, Naruto grows up in a complete family. They could train Naruto together, passing on their unique jutsu. Maybe Minato could finally fulfill his dream of bringing long - lasting peace to the Hidden Leaf with his family by his side. And Naruto would have a different kind of confidence and growth, not having to face the loneliness he did in the original story.
Well, in such a fanfic, Naruto could be the son of someone like Jiraiya. Jiraiya was very close to Naruto and taught him a great deal. He might have had a secret relationship that led to Naruto's birth. Another possibility could be that Naruto is the son of an unknown shinobi from a far - off village who somehow ended up in Konoha.
I'm not sure specifically which fanfic this refers to. There could be various interpretations. Maybe it's a very dark and emotional take where Minato, Naruto's father, is somehow in a situation to witness Naruto's death, perhaps in an alternate universe where things go horribly wrong and the normal protection Naruto has is stripped away.
One possible plot could be Minato and Kushina looking on with pride as Naruto marries Hinata. They might be reminiscing about their own relationship and how far Naruto has come. They could also be interacting with the other guests, sharing stories of Naruto's childhood that the others may not know.
It might be due to jealousy. If Minato was getting more attention or praise in the village for his achievements while Kushina felt overlooked, that could create resentment. Say, Minato was constantly being hailed as a hero for his speed and battle tactics, and Kushina, who also had great power, felt like she was in his shadow.
One possible way this fanfic could go is that Minato and Kushina's spirits could be in a state of limbo and they are forced to witness Naruto's abuse. This could lead to a series of events where they try to find a way to communicate with Naruto or influence the situation to stop the abuse. Maybe they reach out to other characters in Naruto's life to help protect him.
Naruto could be found by Orochimaru. This would be a very dark turn. Orochimaru could use Naruto's potential for his own evil plans. Naruto would be trained in Orochimaru's unethical ways, and his view of the ninja world would be completely distorted. He might become a villain or at least an anti - hero, very different from the Naruto we know in the original story.