One common theme is the shattering of trust. When Percy gets betrayed, it's all about how that trust he had in someone is completely broken. This often leads to him feeling isolated and alone.
Percy would likely feel a great sense of hurt and confusion. He might question his own judgment in trusting Annabeth. He could become more withdrawn and less trusting of others in general.
One great 'percy gets betrayed fanfiction' is 'The Betrayal of Percy Jackson' on FanFiction.net. It really delves deep into the emotions of Percy when he's betrayed by someone he trusts. The author does a wonderful job of building up the relationship before the betrayal, which makes it all the more impactful.
Another reason could be jealousy. Suppose Percy was getting a lot of attention and praise for his recent achievements, and Annabeth felt overshadowed. Her jealousy could fester and turn into a desire to undermine Percy, leading to her betrayal. However, this would be a more complex and less noble reason compared to the others.
One character that could betray Percy is Thalia. She has her own issues with the gods and her place in the world. Maybe she gets jealous of Percy's growing popularity and power among the demigods. So, she decides to side with an enemy to take Percy down a notch. Additionally, some minor characters that Percy has helped in the past could be the ones to betray him. They might feel indebted to him but also resentful at the same time. An enemy could manipulate their feelings and turn them into traitors against Percy.
It could be a jealous rival. This rival might have always been envious of Percy's popularity and skills. So, they manipulate Percy's friends into betraying him to get Percy out of the way and take over his position.
One possible plotline could be that Percy discovers his so - called friends have been secretly working against him all along. Maybe they spread false rumors about him, which makes everyone in his world turn against him. He then has to go on a journey alone to clear his name.
In some fanfictions, Percy's half - brother Tyson might be made to betray him. This could be due to being tricked by some sea monster that convinces Tyson that Percy is a danger to their kind. Also, Grover could be lured into a situation where he has to choose between saving the wild and betraying Percy. It often makes for a very heart - wrenching story as Grover and Percy have such a strong bond. Sometimes, the betrayal comes from an unexpected source like the gods themselves. They might use Percy as a pawn and then turn on him when he's no longer useful.
Apollo might be the betrayed god. He could have been tricked by another god into betraying Percy. For example, Apollo might have been promised more power or a higher status among the gods if he turned against Percy. But then he realizes too late that he's been used and that he's actually betrayed someone who could have been an ally.
Well, one way Percy could be betrayed by the gods in fanfiction is if they break their promises to him. He has done a great deal for the gods, like saving Olympus. But if they don't fulfill their end of the bargain, like granting him certain protections or rewards, that would be a huge betrayal. Another way is if the gods side with his enemies for some political or self - serving reason, leaving Percy out in the cold.