The Avengers' reactions would be diverse. Hulk might not be too interested as he has his own issues to deal with. But if he did read it, he might be intrigued by the idea of demigods having inner powers like he does. Wanda could potentially relate to some of the characters in the fanfic who have to deal with unique powers and how society views them. Vision, with his logical mind, might try to find patterns and meanings in the fanfic that others might miss.
Some of them might be entertained. For example, Thor could see the similarities and differences between his world and Percy's world of gods and monsters and find it humorous. Others like Black Widow might analyze the characters' motives and strategies in the fanfic as she is used to understanding people's minds.
The Avengers would likely have a range of reactions. Iron Man might be dismissive at first, thinking it's just a kid - like fantasy. But as he reads more, he could get interested in the unique magical elements. Captain America, being from a different era, might take a bit longer to get into it, but would probably appreciate the themes of heroism and friendship in the fanfic. Hawkeye might be the one who gets really into it and starts recommending it to the others.
They might be very skeptical at first. After all, Percy's powers are based on Greek mythology which is quite different from their world.
Bruce Banner, when he's not in Hulk mode, would be really interested in the scientific aspects that might be hidden in the Percy Jackson fanfiction. Even though it's a world of magic, he could look for ways that the magic could be related to some kind of scientific principle. He might also be interested in how the characters control their powers, whether it's Percy with his water powers or the Avengers with their various abilities, and look for similarities in self - control and management of power.
He'd probably be shocked. Percy is used to living his own story, not reading someone else's take on it.
Percy would probably be very confused at first. He's used to dealing with threats from the world of Greek mythology, not superheroes like the Avengers. But once he realizes he's been kidnapped, he'd likely be angry. He'd try to find a way to escape using his powers, like controlling water to create distractions or even using it to overpower his captors.
Percy's reaction would be complex. On one hand, he would respect the Avengers' powers. He'd see Iron Man's intelligence - based powers as a different kind of 'gift' compared to his own demigod abilities. He might be a bit intimidated by the combined might of the Avengers at first. But then, he would start to analyze their powers. He would think about how Captain America's leadership and physical abilities are like the qualities of some of the heroes in his own world. And he'd be constantly comparing and contrasting their powers with his own and those of his friends, trying to find common ground or new ideas that could help him in his own adventures.
Percy would be angry. He has been through a lot in his own world and being betrayed again would not sit well. He'd probably lash out with his powers at first.
Thor would be the most likely to relate to her on some level, as he comes from a world of gods and magic too. He might see her as an equal in a way. Bruce Banner would be interested in the scientific aspect of how her powers work, if there is any scientific explanation within the context of the fanfiction. And the others like Clint Barton and Wanda Maximoff would be curious about her background and how she ended up in their world.
Percy would probably be very angry. He's used to being a hero, not a captive. He might immediately start trying to break free, using his water powers to create distractions or even attack if he feels really threatened.
Some of the Avengers might be hostile at first. They're used to dealing with threats and Percy, being an unknown with strange powers, could be seen as a danger. But others, like Captain America, might be more open - minded and willing to give him a chance. Stark would probably be very curious about Percy's powers and how they work, and might even try to find a scientific explanation for them.
Percy would be really conflicted. On one hand, he's used to following the orders of the gods, but on the other, he knows the Avengers are heroes. He'd probably feel guilty about banishing them. The Avengers would be confused and angry. They'd try to figure out who Percy is and why he's banishing them. Iron Man might try to use his technology to find a way out of the banishment, while Captain America would be more focused on trying to reason with Percy.