Minato would likely have a more reserved reaction, but his eyes would shine with pride at Naruto's achievements. He might be seen smiling softly when Naruto masters a difficult jutsu. Kushina would be more vocal. She would shout words of encouragement even though Naruto can't hear her. When Naruto shows his Uzumaki tenacity, Kushina would be beaming with pride, and she would probably nudge Minato and say something like 'Look at our boy!'
Minato would probably be very proud. He might notice Naruto's use of his own jutsu and be impressed by how Naruto has developed his skills. Kushina would be more emotional, maybe crying at the sight of Naruto growing up so well.
Many fanfictions show their relationship as one of mutual respect and admiration. Minato is often portrayed as being attracted to Kushina's strong will and red - hot hair, which is a symbol of her fiery personality. They start as friends, training together and gradually realizing their feelings for each other.
Well, in some fanfictions, the moment when Minato sacrifices himself to save the village while Kushina is already dead is extremely emotional. It shows his selflessness and also the love he has for the village and his family. Also, the flashbacks in some stories about their early days together, like when they trained together as young ninjas and slowly fell in love, are really sweet and emotional.
One popular one might be where they watch Naruto's training sessions in a sort of time - warp scenario. It shows their reactions to his growth and determination.
On a more personal level, they could face internal guilt. As Naruto grows up and achieves great things on his own despite their neglect, Minato and Kushina may realize what they've missed out on. This realization could cause them a great deal of internal turmoil and regret for not being there for their son when he needed them.
One possible reason could be a misunderstanding. Maybe Minato thought Kushina had done something to endanger Naruto when in fact she hadn't. In the heat of the moment, he lost his temper and slapped her.
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.
Some fanfictions might revolve around alternate universes where Minato and Kushina have different fates. Maybe in one, they are both more powerful than in the original story and change the entire landscape of the ninja world. These stories often offer unique takes on their characters and the Naruto universe as a whole.
One interesting fanfiction could be about Minato and Kushina's relationship before Naruto was born. It might explore how they fell in love and their hopes for the future. Another could be a story where Naruto discovers some hidden secrets about his parents through some magical or mysterious means. Maybe a time - travel fanfiction where Naruto goes back in time and gets to meet his parents when they were young.
In many Naruto fanfictions, Minato is often portrayed as an even more brilliant strategist and a loving husband. He might be shown using his Hiraishin no Jutsu in creative ways to protect Kushina. For example, in some stories, he uses it to surprise her with little gifts or to show up just in time when she's in danger.
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.