The betrayal would shatter their relationships in many ways. Percy, Thalia and Nico would be constantly on edge around each other. They would question every action and word of the others. Percy might try to hold the group together, but his efforts could be in vain if Thalia and Nico are too wrapped up in their own feelings of hurt and betrayal. Thalia might start to form her own plans for revenge without consulting the others, which would further divide them. Nico, being the more solitary of the three, might disappear for a while to figure things out on his own, leaving Percy and Thalia to deal with the aftermath of the betrayal alone at first.
Their relationships would likely become more strained and cautious. Percy, who was always somewhat trusting, might become more guarded. Thalia could become more angry and vengeful, which might put a strain on her relationships with the others. Nico, already a bit of an outsider, might retreat further into himself. They would have to relearn how to trust each other, as the betrayal might make them question if there are any more secrets among them.
After being betrayed, Percy might feel a sense of disappointment towards his friends, which could make him less likely to be as open as he once was. Thalia would probably be furious and might lash out at those she feels are responsible, including Percy and Nico if she suspects any misstep on their part. Nico, on the other hand, might start to distance himself from the group, feeling that they are all in a vulnerable position now. Their relationships would be full of tension and mistrust until they can work through the issues caused by the betrayal.
In a fanfiction about their betrayal, it could be that they are betrayed by a new character who infiltrates their group. This new character might seem friendly at first but then turns on them to further their own secret agenda, perhaps related to an ancient prophecy. Percy, Nico and Thalia would then have to figure out how to stop this new threat while also clearing their names.
One possible plotline could be that Percy, Thalia and Nico are betrayed by their closest friends within the demigod community. Maybe they are framed for a crime they didn't commit, like stealing a powerful artifact. This could lead to them being hunted by their own kind. They would then have to go on the run, trying to clear their names while also facing various monsters that are after them because of the false accusations.
Percy might feel a deep sense of hurt. He values friendship highly, and this betrayal would make him question who he can trust. He could become more guarded and less likely to trust new people easily. Reyna would be more focused on the bigger picture. She would see the betrayal as a threat not just to herself but to the stability of the demigod world. So she would start gathering her allies, those who still believe in her, and form a strategy to counter the false accusations and the forces behind the betrayal. She would be determined to prove that she and Percy are not the traitors they are made out to be.
Well, they might lose trust in their friends. For example, if they were betrayed by someone they considered a close ally in the demigod world, like a fellow camper at Camp Half - Blood. Percy could become more withdrawn, as he has always been a bit of a loner at heart. Thalia might turn bitter and angry, using her skills as a hunter more aggressively. Nico, being the son of Hades, could potentially be pushed towards using his darker powers in retaliation, perhaps even seeking vengeance in the Underworld's way.
Percy might be angry at first. He's used to being a loyal friend, so betrayal would hit him hard. He'd probably try to find out the truth and clear his name. Jason, being a more diplomatic type, might initially be shocked and then try to reason with those who betrayed him. Nico, on the other hand, could retreat into himself. He has a more solitary nature, and the betrayal might make him even more withdrawn.
Well, their relationships might become more complex. For example, Percy and Thalia might have a different dynamic as they see each other in a new light in the past. Since they are in a different time, they may rely on each other more for survival, which could strengthen their bond. Nico, being a bit of an outsider among them, might find himself more in tune with Percy and Thalia as they face the challenges of the past together. They may also form new relationships with people from the past, which could in turn affect their relationships with each other.
Their relationships could develop in many ways. At first, Percy and Thalia might have some friendly bickering as they used to, but with Nico there, they start to form a more united front. Nico, being a bit more withdrawn, might gradually open up to them more as they face challenges together. Percy could use his natural leadership skills to bring them together, and Thalia's fierce loyalty would make her a great ally for both of them. As they rely on each other more in the chaotic situations, their bonds would strengthen into deep friendships.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.
They could be like siblings. Percy and Thalia might act as the older siblings, protecting and guiding Nico. Percy, with his leadership skills, and Thalia, with her combat abilities, would be great at looking out for the younger Nico. They could also be like cousins, with a close - knit bond but still having their own individual family heritages that sometimes create interesting dynamics.
Percy and Nico might grow closer as they face new challenges together in Hogwarts. Thalia could initially be a bit of an outsider to their relationship but then gradually become more involved. Percy could act as a mediator between Nico and Thalia at times.