One possible fanfiction could be where 'evil Minato and Kushina' are under some sort of dark magic or mind control. They find Naruto not as their beloved son but as a target. Maybe they are being manipulated by a powerful enemy of the village who wants to use Naruto's power for evil. However, Naruto's pure heart and the bonds he has formed with his friends start to break through the false personas of his parents.
There could also be a fanfiction where 'evil Minato and Kushina' find Naruto in a parallel universe. In this universe, they are evil due to different circumstances in their past. They initially want to use Naruto for their own dark purposes, like taking over that parallel Konoha. But Naruto, with his unwavering will, tries to show them the error of their ways and bring them back to the side of good.
In a different take, 'evil Minato and Kushina' find Naruto, but this discovery is part of a plot to change the future. They might believe that Naruto will cause great destruction in the future, so they plan to eliminate him. But as they interact with him, they start to see the good in him and question their own motives. This could lead to a redemption arc for them as they fight against the 'evil' that was influencing them.
They would be absolutely devastated. Minato, as Naruto's father, would likely be filled with guilt for not being there to protect him. Kushina, as his mother, would be heartbroken. They might first be in a state of shock, unable to believe what has happened. Minato might blame himself for leaving Naruto alone in a world full of dangers. Kushina would probably hold Naruto's body close, crying uncontrollably, and their grief could be so overwhelming that it would change the entire course of the ninja world they live in as their connection to Naruto was a major part of their lives.
In a fanfiction, perhaps Minato and Kushina are resurrected during a powerful enemy attack on the village. Naruto is in the middle of the battle when he suddenly sees his parents. At first, he can't believe it. Kushina runs to hug him tightly, while Minato stands there with a proud look. They then join the fight together, using their combined skills to defeat the enemy and have a moment of family reunion.
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 great fanfiction idea could be a story where Naruto time - travels back to when his parents were alive. He gets to experience their lives, learn from Minato's skills as a ninja and Kushina's strong - willed nature. This could be a heartwarming story of family bonds and Naruto getting to know his parents in a more personal way.
I'm not aware of any Naruto fanfiction with such a distasteful plot. The Naruto series is mainly about friendship, love within family and between comrades, and the pursuit of dreams. This kind of content that violates the positive values of the original work is not something that should be promoted in the fanfiction community.
In many Naruto fanfictions where Naruto meets Kushina and Minato, it often creates a very emotional scenario. Naruto finally gets to meet his parents who he has only heard about. It could be a heart - warming reunion where they share stories, hugs, and Minato and Kushina get to see how far Naruto has come.
Well, perhaps in this fanfiction, Evil Minato and Kushina find Naruto when he is at a very vulnerable state. They see an opportunity to use him for their evil plans. Their plans might involve using Naruto's Jinchuriki power to open a portal to a dimension full of dark energy. But Naruto, being the resilient character he is, tries to resist them. He calls upon the memories of his friends and the village that has always supported him, and he gradually starts to turn the tables on his 'evil' parents.
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 idea could be that Naruto grows up with his parents in a world where the Nine - Tailed Fox attack never fully happened. Minato and Kushina could train Naruto from a young age, passing on their unique jutsu and wisdom. Maybe Naruto would be less of an outcast and more of a confident shinobi early on.
One possibility could be that in the fanfiction, Kushina and Minato see Naruto becoming a great Hokage, respected far and wide. They might see him bringing peace to the village and forging strong alliances with other nations. This would make them extremely proud as they watch from whatever afterlife or special visionary state they are in.