She might be thinking about how the fanfiction either stays true to the original relationship dynamics between her and Naruto or how it changes in interesting ways.
He might be really amazed. He'd see different versions of his world and himself, which could make him think about his own life and choices in a whole new light.
Naruto might feel a bit of nostalgia. He would see elements of his own past and how the new generation, like Boruto, is being portrayed in these fictional stories. He could also be proud to see how much his son has inspired fans to write so many different stories.
Some characters might be amused. For example, Naruto himself could find it funny to see how others imagine his adventures in different ways. He might laugh at some of the out - of - character interpretations but also be intrigued by the creative storylines.
Ruby would be the most enthusiastic among RWBY characters. Since she is always eager for new and exciting tales, the Naruto fanfiction would be like a new world for her to explore. Weiss, being the more refined one, would look for the literary merits in the fanfiction. Blake, with her own complex backstory, would resonate with the character - driven plots in Naruto fanfiction. Yang, on the other hand, would just want to see some epic showdowns and would get pumped up during those parts.
Sakura would be interested in how the fanfiction depicts her growth and her relationships, especially with Naruto and Sasuke. She might be flattered if she is shown as a strong and important character in the fanfiction. On the other hand, she could be a bit annoyed if the fanfiction undermines her abilities or portrays her in a negative light that she doesn't deserve.
They might be really intrigued. Ruby, with her love for adventure stories, could be excited by the unique jutsus and battles in Naruto fanfiction. Weiss might be a bit critical at first, but then get drawn into the complex relationships. Blake could find parallels between the themes of discrimination in Naruto and her own experiences in RWBY.
He might be really surprised. Since he's used to his own real - life adventures, seeing different interpretations in fanfiction - based anime could be quite a shock. For example, if the fanfiction shows a different version of his relationship with Sasuke, he would be taken aback.