If Minato slaps Kushina in a fanfiction, it could be a turning point in the story. It would go against the typical view of their relationship where they are shown to be very much in love. This could be part of a plot device to show Minato's darker side or perhaps he was under some sort of mind control. Kushina would be outraged, and it could lead to a big conflict in the fanfiction. Naruto might then have to deal with the complex legacy of his parents' troubled relationship when he discovers this event later on.
In a fanfiction, if Minato were to slap Kushina, it would be a huge shock to the Naruto - Kushina relationship. It could potentially cause a rift between Naruto and his father Minato in Naruto's mind. Also, Kushina would likely be deeply hurt and angry, which might lead to her distancing herself from Minato. This event could also change the way Naruto views his family's past and his parents' relationship.
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.
One possibility is that Naruto has an out - of - body experience and is able to communicate with his parents in a spiritual realm. They could give him advice on how to deal with his enemies and his inner demons.
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.
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.
Well, in such a fanfiction scenario, Minato and Kushina watching the future could lead to a whole new set of actions. If they saw the destruction that Pain would cause to Konoha, they might start training Naruto earlier or even try to find a way to stop Pain's creation in the first place. Also, they could be saddened by the losses that occur in the future and strive to strengthen the village's defenses preemptively.
Well, in such a fanfiction scenario, Minato and Kushina reading the future would be a game - changer. They may use the knowledge to prevent the Nine - Tails attack on the village. They could also influence Naruto's upbringing in a more direct way. They might see the rise of new enemies and start training the next generation earlier to combat those threats. This would completely rewrite the Naruto story in many ways.
One idea could be that as Minato is dying, he passes on his special jutsu knowledge to Naruto in a final moment of father - son connection. Kushina, on the other hand, tries to comfort Naruto while also mourning Minato.
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.
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.
One possibility is that Minato and Kushina would be overjoyed to see Naruto again. They would probably first have a very emotional reunion, hugging him tightly. Then, Minato could start training Naruto more intensively, passing on some of his most advanced jutsu techniques that he didn't have time to teach before. Kushina, on the other hand, would likely focus on the more motherly aspects. She might cook all of Naruto's favorite meals and give him the love and care he missed during his childhood. Also, their presence could change the political situation in the Hidden Leaf Village as Minato was a respected Hokage. Their return could boost the morale of the villagers and make the village even stronger in the face of threats.