He could be seeking revenge. After being betrayed, Percy might see Shield as a means to get back at those who wronged him. By joining Shield, he may think he can gain the power and resources needed for revenge.
Well, one possibility could be that Percy uses his skills from his own world to help SHIELD in combat situations. Maybe his ability to control water could be useful in, say, putting out fires caused by super - villains or in creating barriers against enemy attacks. He could also interact with SHIELD agents in a really interesting way, like teaching them some of his own combat techniques.
If Percy Jackson joined SHIELD in fanfiction, it would be a wild ride. Percy's sword - fighting skills and his connection to the gods would give SHIELD a whole new dimension. He might start by being a bit of an outcast among the agents who don't believe in the Greek gods at first. But when they see his powers in action, like summoning water from thin air or running super - fast on water, they'd be in awe. And he could also help SHIELD deal with any mythological threats that pop up, which the normal agents might not be equipped to handle.
Percy's water - controlling powers could be a great asset in the SHIELD universe. For example, in a situation where there's a flood or a water - based attack by an enemy, he could easily manipulate the water to turn the situation around. His powers might also be useful in interrogations. He could create a water - based illusion or something similar to intimidate the bad guys.
Percy might initially be confused. He might start to question everything that led up to the betrayal. His mind could be racing, trying to figure out if there were any signs he missed. He might also be hurt, but the confusion could overshadow the pain at first as he tries to make sense of the situation.
If Naruto were to join Shield in fanfiction, it would be an interesting mix. Naruto's chakra control and his ability to learn new techniques quickly would give Shield an edge. He could potentially train some of the Shield agents in his ninja ways. His experience in fighting powerful foes in his own world would be valuable in dealing with the threats that Shield faces.
Well, it could be really exciting. Harry's magic skills would bring a whole new dimension to Shield's operations. He could use spells for various tasks like stealth or information gathering. Maybe he'd help Shield agents against magical threats that they previously couldn't handle.
Yes, there could be. Writers often like to cross over different fictional universes. In such a fanfiction, Percy Jackson's demigod skills would be interesting to incorporate into the world of Shield agents. Maybe his water - controlling abilities could be used in some sort of covert operation, like creating distractions or even rescuing agents in a flooded area.
It could be a jealous friend. Maybe another demigod who is envious of Percy's powers or his popularity among their peers. This friend might see an opportunity to get Percy out of the way and so betrays him.
One common theme is loyalty. Percy often has to show his loyalty to the agency or his comrades in the fanfiction. Another theme is the fight against evil. He's usually depicted as facing some sort of powerful and malevolent force. And self - discovery is also there, as Percy learns more about his own abilities and his place in the world of agents.