Killua is likely to be completely devastated. He might go into a state of shock at first, not believing that Gon is really gone. Then he could become very angry, either at himself for not being able to protect Gon or at the situation that led to Gon's death.
At the start, Ash might underestimate Hunter J's yandere nature. He'd think he could just handle her like any other enemy. But as she starts to show her obsessive side, like targeting his Pikachu specifically or trying to isolate him from his friends, Ash would become more cautious. He would start to analyze her motives and actions more carefully. He might even try to find out if there's a way to cure her of her yandere tendencies, but if that's not possible, he'd be ready to battle her with all his might. His love for his Pokémon and his friends would fuel his determination to stand up to her.
In some fanfictions, Gon might initially be shocked. He has seen Hisoka as a somewhat eccentric but strong ally. When he discovers Hisoka's more sinister side, like his love for fighting to the death and his disregard for normal moral boundaries in battle, Gon could be conflicted. He might feel a sense of betrayal because he thought Hisoka was more on the side of 'good' in their adventures. However, Gon's own sense of justice and his unwavering belief in his friends could lead him to confront Hisoka about his true nature.
The friends' reactions would depend on their own personalities and relationships with Rip and Sara. Nate might be the one to crack jokes at first to ease the tension but then become very serious about making sure they have all the resources they need. Amaya could see it as a sign of new life and growth in their group, and would be eager to help Sara adapt to her changing body and new role as a mother - to - be. And Captain Cold, if he were still around, might be a bit cynical but still secretly hope for the best for them.
She could also be angry. After all, she might feel that her freedom has been unjustly restricted. However, as she starts to understand the hunter's motives, she may gradually come to accept the situation. For example, if the hunter shows her evidence of the threats outside, like tracks of dangerous animals or signs of other menacing humans, she might start to see his point.
Well, some React developers might be interested in MCU fanfiction as a form of entertainment. They could enjoy reading about different takes on their favorite MCU characters while also bringing their React - related thinking into it. For example, they might think about how to build an app that could display and manage different fanfiction stories in an organized way, like creating components for different story elements.
There would be a complex reaction. The legal system would struggle to define the status of these animals. Are they protected like normal animals? Or are they something else entirely? Conservationists would be in a tough spot as they usually protect animals but these are not normal animals. Animal rights activists would be very vocal, but their usual arguments about animal rights might not fully apply here. And on a global scale, different cultures would have different reactions based on their beliefs and values.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.