At first, Naruto and Kushina might start to distance themselves from Minato. They could avoid him and not talk to him as much. As time goes on, the hatred might grow deeper. Naruto could start to oppose Minato in public or in important village matters. Kushina might also try to influence others in the village against Minato.
One possible fanfiction could be about Minato and Kushina watching over Naruto from the afterlife as he grows into a great ninja. They could be his silent guardians, influencing his decisions in subtle ways.
The village of Konoha would also be affected. With Minato still alive, he could continue to lead the village and make different decisions. This might change the relationships between Konoha and other villages. For example, there could be more peaceful alliances as Minato is known for his diplomatic skills. Also, Kushina being alive would mean that the Uzumaki clan might have a stronger presence in the village, which could lead to new jutsu developments and a different power balance within Konoha.
Their relationship was based on mutual respect. Minato respected Kushina's strength and determination, and Kushina respected Minato's skills and leadership qualities.
It could completely change the dynamics of the Naruto universe. Their presence might have prevented many tragedies and shaped Naruto's life differently.
One great Minato and Kushina AU fanfiction could be 'The Alternate Life of Minato and Kushina'. In this fic, they might be in a world where the Nine - Tails attack never happened, and they get to raise Naruto in a peaceful Konoha. It shows their family life in a different light.
One way it could happen is if Naruto somehow gains the ability to travel back in time. Maybe through a powerful jutsu or a unique kekkei genkai. He could then use his knowledge of future events and his combat skills to save his parents from their tragic fate.
One common theme is the idea of redemption. Maybe in some fanfictions, Minato or Kushina have something they feel they need to make up for in the afterlife, and it involves helping Naruto in some way. Another is the theme of growth. Naruto grows up without his parents, but in fanfiction, they can be a part of his growth process in some supernatural way. And of course, the theme of heroism runs through a lot of these stories, as Minato was a hero, and Naruto becomes one too, and Kushina was a strong kunoichi.
A great fanfiction concept could be that Minato and Kushina are resurrected during a crucial battle in Naruto's life. Their presence gives Naruto a huge morale boost. They fight side by side with Naruto against a powerful foe. After the battle, they decide to stay in the village and help Naruto rebuild and strengthen it. This would not only be a great action - packed story but also a heartwarming family reunion story.
One possible plotline could be that Minato and Kushina focus on teaching Naruto advanced chakra control. Since Minato was known for his Flying Thunder God Technique which required precise chakra control, he could pass on those skills. Kushina, with her strong chakra, might teach Naruto how to better harness his own Uzumaki chakra reserves. For example, they could start with basic exercises like tree - walking and water - walking, but with a twist. Minato could show Naruto how to use his chakra in a more efficient and strategic way during these exercises, preparing him for more complex jutsu later.