In fanfiction, Percy Jackson might betray the Avengers because of loyalty to his own world. The demigod world has its own rules and problems. If the Avengers' actions start to interfere too much with the demigod world's balance, Percy could see them as a threat. For instance, if the Avengers accidentally release a powerful ancient evil in the demigod realm, Percy might take it upon himself to stop the Avengers from causing more harm, which could be seen as betrayal from the Avengers' perspective.
Well, in some fanfiction scenarios, Percy Jackson might betray the Avengers due to a misunderstanding. Maybe he's been misinformed about the Avengers' intentions towards the demigods. For example, if he hears false rumors that the Avengers plan to control the demigods, he could turn against them in a fit of protectiveness for his kind.
In some fanfictions, Percy might betray Chaos if he discovers that Chaos's plans are more harmful than he initially thought. For example, if Chaos intends to destroy all of creation and remake it in a way that Percy believes is wrong.
Percy has his speed and agility. In the fanfiction, he might be able to use his demigod reflexes to dodge all of the Avengers' attacks. He could then quickly move in for a counter - attack. Also, his sword, Riptide, is a powerful weapon. It can cut through almost anything. He could use it to cut through the Avengers' weapons or their defenses if he gets close enough.
One way could be to have Percy Jackson's powers of being a demigod interact with the superpowers of the Avengers. For example, his ability to control water could be used in a joint mission with Thor's lightning powers. Maybe they are facing a common enemy that can only be defeated by combining their unique skills.
Well, Percy could use his water - controlling abilities to put out fires during the Avengers' battles. His skills with a sword could also be useful in close - combat situations against the bad guys.
Percy could fit in as a strategist. His experience in dealing with various gods and monsters gives him a unique perspective on handling threats. He might suggest different approaches that the Avengers haven't thought of before, like using the environment in a more creative way, similar to how he uses water in his battles as a demigod.
The gods are always a possibility. Zeus, for example, has been distrustful of Percy in the past. If Zeus feels that Percy is getting too powerful or is a threat to his rule, he could engineer a situation where Percy is betrayed. He might use other demigods or even mortals to turn against Percy.
Well, Percy could use his water powers to put out any fires or floods that the Avengers might be facing. His ability to control water could also be used to create barriers against enemies. For example, if the Avengers were up against a powerful fire - based villain, Percy could summon a huge wave to douse the flames and save the day.
In a fanfiction context, Percy Jackson could avoid being hunted by the Avengers by using his knowledge of the magical world. He could seek help from other demigods or even some friendly gods. Maybe they could create a diversion or put a spell on the Avengers to make them forget about Percy. Also, Percy could try to blend in with the normal humans. Since he's half - human, he could act like an ordinary person and not draw attention to himself. But this would be difficult as his powers sometimes act on their own.
Percy could use his water powers. He could summon water from nearby sources, like pipes or even the air if it's humid enough. With the water, he could create distractions, like water walls or waves to disorient the Avengers. Then he could make a run for it.
There's a chance that it could be a character from Percy's family. For example, a distant relative who has been corrupted by some dark magic. They might betray Percy for their own gain or because they are being controlled, and this betrayal could lead to Percy being killed.