Well, Ruby might be shocked at first. She's used to seeing Jaune as a friend and teammate, so imagining him as Satan would be a huge contrast to her view of him. She might be a bit scared too, depending on how the fanfiction portrays it.
The RWBY team's reactions in the fanfiction when Jaune is betrayed would be complex. Ruby's reaction would be centered around hope and finding a solution. She'd likely try to talk to Jaune and see how he's feeling. Weiss would be outraged and demand justice for Jaune. Blake would be more introspective, perhaps relating the situation to her own past. Yang would be the most vocal and immediate in her anger. Their reactions would shape the further plot of the fanfiction, whether it leads to revenge, forgiveness, or something in between.
Yang would probably have a very vocal reaction. She's not one to hold back her thoughts. She might laugh it off at first, thinking it's just a wild and crazy idea. But if the fanfiction starts to get into some deep and dark themes related to Jaune being Satan, she could become more serious. For instance, if it shows Jaune causing harm to their friends in the story, Yang would be angry and protective.
Well, they could face a really tough Grimm together. Ruby's Crescent Rose would be slashing away while Jaune uses his shield to protect them both. Maybe Ruby gets injured and Jaune has to step up and use some new combat moves he's been practicing. It would be a moment of growth for him.
In some fanfictions, they might team up to prove their worth and get reinstated. They could go on a journey to uncover a conspiracy that led to their expulsion.
They would likely have a range of reactions. Yang would probably be impressed by the physical strength and training of some of the soldiers. The RWBY team as a whole would have to grapple with the idea of a military that doesn't rely on Dust or Aura. They might see the Earth military's technology as both a great advantage and a potential danger. If they were to react in a story, it could lead to some interesting crossovers where they try to learn from the Earth military or vice versa.
Well, they might be really impressed by John Wick's badassery. RWBY characters are used to combat and action, but John Wick has his own unique style. They could be in awe of his skills with guns and his determination. Maybe Ruby would be excited to see his combat moves and try to incorporate some of them into her own fighting style.
Well, they might be really surprised. Ruby, for example, would probably be super interested in how the Rusted Knight is portrayed in the fanfiction. She might be excited to see new interpretations of his character, his backstory, and his adventures. Weiss could be a bit more critical, analyzing the writing style and how it fits with the existing RWBY lore. Blake might see parallels between the Rusted Knight's story and some of the themes in the real RWBY story, like the struggle against darkness. Yang, on the other hand, would be looking for the action parts and how the Rusted Knight kicks butt in the fan - made story.
In the fanfiction, RWBY could have different reactions. Ruby would likely be wide - eyed and full of questions. She'd want to know why people were fighting over land and power in such a different way. Weiss would be more reserved, but deep down she'd be thinking about how it related to the kingdoms in their world. Blake would see the treaty as a way to either oppress or liberate people, depending on how it was implemented. Yang would probably make jokes about how slow the negotiations must have been compared to a fight in their world.
If RWBY were to react to Spy x Family fanfiction, they would bring their own perspectives. Ruby, with her innocent and curious nature, would likely be intrigued by Anya's telepathic abilities. Weiss, being more refined, might analyze the political and social aspects of the Spy x Family world. Blake, having experienced secrecy herself, would empathize with the characters hiding their true identities. Yang would enjoy the comical moments and the action - packed sequences, like when Loid does his spy stunts.
Jaune might react with shock at first. It's like his world is turned upside down suddenly.