Well, the reaction would be mixed. There would be those who are in awe, especially if the child shows some early signs of having great powers like Percy. They would welcome the child with open arms. However, there would also be campers who are more cynical. They might think the child is just trying to ride on Percy's fame. They would keep their distance until the child proves themselves worthy. And then there are those who are just plain jealous. They might see the child as a threat to their own status at the camp.
Some campers might be excited. They could see the child as a symbol of Percy's legacy and be eager to train them. Others might be cautious. They would worry that the child could attract unwanted attention from the monsters that Percy has fought in the past.
In a fanfic, the campers' reaction to a child of Percy Jackson showing up at camp would depend on a lot of factors. If the child arrives during a time of peace at the camp, they might be more accepting. But if the camp is on high alert due to recent attacks, they could be more suspicious. Also, the child's personality would play a role. If the child is friendly and outgoing, they might win over the campers more quickly. If they are shy or standoffish, it could take longer for the campers to warm up to them. There could also be a group of campers who are more interested in the child's heritage and what secrets they might hold about Percy's life.
Grover would be panicked. He's Percy's friend and he cares a great deal about him. He might start running around trying to find help, like looking for a healer or someone with magical healing abilities. He'd probably be muttering to himself about how he should have protected Percy better.
The younger campers might look up to Percabeth in a new way. They could see them as having this grown - up relationship and starting a family, which is a big deal. However, the older campers, especially those who have been at camp for a long time and are more set in the camp's traditional ways, might be a bit more judgmental. They could worry about how this would affect the camp's atmosphere or the example it sets for the other campers. And there would surely be a group of campers in the middle who are just kind of confused and don't know what to think.
They might be very skeptical at first. After all, Percy's powers are based on Greek mythology which is quite different from their world.
In a fanfic, if a child of Percy Jackson shows up at camp, it could lead to some interesting plot twists. For example, the child could be on a secret mission related to Percy's past adventures. Or perhaps the child has a connection to an old enemy that the camp thought was defeated. This could bring new danger to the camp but also an opportunity for the characters to grow and work together.
Annabeth would be devastated. She and Percy have a deep connection. She might go into a state of shock at first, then be filled with a fierce determination to find out who was responsible and make them pay. She would probably also be racked with guilt, thinking she could have done something to prevent it.
He'd probably be shocked. Percy is used to living his own story, not reading someone else's take on it.
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 demigod world would likely be in shock. The hunters of Artemis are sworn to chastity, so for Artemis to have a child would go against everything they stand for. The other demigods might be confused and a bit scared too. Some might see the child as a threat, fearing it could have some sort of super - powerful abilities.
There would also be those who are angry. Some of the campers who have always been a bit jealous of Percy's status might think he's just being selfish or irresponsible. But deep down, they'd also be a bit concerned for his well - being, even if they don't show it at first.
Annabeth would be completely devastated. She would probably go into a state of shock at first, then be filled with anger and determination to find a way to bring him back, if possible. She might even go on a solo quest to try and reverse his sacrifice.