Minato might be intrigued. He would be interested in seeing how the fans expand on Naruto's journey. Kushina would be delighted, seeing her son as the center of so many different tales.
Minato could be a bit bemused at first. He might wonder why people are writing their own versions of Naruto's story. But as he reads more, he would start to respect the creativity. Kushina would be overjoyed. She would probably read every single fanfiction she could get her hands on. She would be so proud that Naruto has inspired so much creativity in the fans. She might also be a bit protective, though, and might not like it if Naruto is portrayed in a negative light in some of the fanfictions.
Minato would likely have a rather analytical reaction. He would study how the fanfiction authors handle the ninja techniques and the political aspects of the Naruto world. Kushina would be more focused on the emotional side. She would love to see how Naruto is portrayed in terms of his relationships with his friends and family in these stories. She would be really happy to know that Naruto has such a big fan following that they create their own stories about him.
Minato would likely be extremely shocked. Naruto is his son, and the idea of Naruto attacking him would be completely unexpected. He would probably try to talk to Naruto first, to find out what is wrong and why he is being attacked.
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 some cases, Naruto might initially become bitter towards his parents. But as he experiences more in life and learns about the possible reasons behind their actions, he could come to understand and even forgive them. His reaction would also depend on the people around him. If he has good friends or mentors, they could help him deal with his emotions in a more positive way.
Well, Minato being the calm and collected type, would probably approach reading Naruto fanfiction with an open mind. He might find some of the stories that depict his heroics in new and interesting ways quite fascinating. Kushina, on the other hand, would be more vocal. She'd either love the fanfiction that shows her as a loving mother and strong kunoichi or be a bit critical if it doesn't match her self - image. For example, if a fanfiction portrays her as too weak, she'd be likely to scoff at it. But overall, they'd both enjoy seeing the different ways the fans have imagined their lives.
They would be shocked at first. Minato would be filled with pride and joy seeing his son all grown up. Kakashi would respect Naruto's strength. Obito might be a bit envious of Naruto's popularity but also admire his spirit. Rin would be very friendly towards Naruto.
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.
They would likely feel a sense of pride and interest. Seeing different versions of Naruto's adventures and growth in fanfiction would make them proud of how much their son has inspired the fans.
Naruto would probably be really confused at first. He's used to a loving mother figure, not a yandere one. He might try to talk to her and understand why she's acting so strangely.
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.
Minato and Kushina's reactions could vary widely. Minato, being a strategic thinker, might initially be skeptical about how well the two very different universes of Naruto and RWBY can be combined in fanfiction. But as he reads on, he might appreciate the creativity involved. Kushina, with her fiery personality, could be excited or even a bit outraged if the fanfiction takes too many liberties with the Naruto characters she loves. She may also find it interesting to see new adventures for Naruto and his friends in this RWBY - inspired setting.