His relationship with his old friends from Camp Half - Blood would likely be strained. They might not understand his decision to join the Chaos Army and think he's turned his back on them. However, he could also make new friends within the Chaos Army who share his new goals and values.
When Percy joins the Chaos Army, his relationship with the gods could also change. The Greek gods might see him as a traitor or a threat, depending on how they view the Chaos Army. In the Chaos Army, Percy may form a bond with comrades who are from different backgrounds and have different powers. These relationships could be based on mutual respect for each other's skills in battle and a shared sense of adventure in exploring the new world of the Chaos Army. His loyalty would be divided at first, but as he gets more involved with the Chaos Army, he might find himself more attached to his new comrades.
He might become more aloof. Since Chaos is such a vast and unpredictable concept, Percy may start to distance himself from his old, more emotional self. He could become more calculating as he has to deal with the new and often dangerous situations in the chaos realm.
His relationship with Annabeth would become more complicated. Long - distance and the difference between the two camps could put a strain on their relationship. Among the Romans, he might develop a close friendship with some of the more battle - hungry demigods who admire his skills. He could also have a rocky start with the Roman leaders who may be cautious about his motives.
In a 'Percy Jackson Father of Chaos' fanfiction, Percy's relationships would be in upheaval. His friendship with Grover would face a test. Grover, who has always been Percy's loyal friend, would now have to deal with a Percy who is unpredictable at times. Percy might accidentally cause chaos that affects Grover's nature - related tasks. With the other demigods at Camp Half - Blood, Percy would become a sort of enigma. Some would look up to him as a new kind of hero, while others would be jealous of his new - found power. His relationship with the sea gods, like Poseidon, would also change. Poseidon might be proud that his son has such a powerful new role, but also worried about how Percy will use his powers and how it will reflect on the sea god's domain.
One possible plot could be that Percy, with his battle experience from the Greek world, quickly rises in the ranks of the Chaos Army. He might bring new strategies inspired by his demigod training, like using the element of water in unexpected ways during battles. His loyalty and sense of justice could also lead him to take on difficult missions for the Chaos Army, such as infiltrating enemy camps that are otherwise impenetrable.
Percy's view of the mortal world would expand. Being in the army, he'd see a different side of mortals - their teamwork, their sense of duty. He might also learn new skills like military strategy that could enhance his demigod fighting abilities. His loyalty might be tested as he has to balance his loyalty to his demigod friends and his new military comrades. And his sense of self - worth could change as he discovers new ways to contribute in a military setting.
He'd become more powerful. His combat skills would be enhanced, and he'd have a better understanding of the primordial forces. He might also become more unpredictable in battle, like Chaos itself.
If Percy joins the Volturi in fanfiction, his personality could change in multiple ways. At first, he might be very resistant to their ways. But as time passes, he could become more like them in some aspects. He would be surrounded by vampires who are mainly concerned with power and control. This could make him more power - hungry. But also, Percy has a strong sense of justice. So, he might try to use the Volturi's power structure to enforce his own sense of right and wrong. This could lead to him being more authoritarian in his approach. He might also become more isolated as he can't fully trust the other Volturi members, which could make him more withdrawn and less likely to show his true emotions.
If Percy Jackson gets a trident in fanfiction, his relationships would shift significantly. His friends like Annabeth would see him as an even greater asset in their quests. However, some might also be worried that the power of the trident could go to his head. His enemies, especially those from the sea - related villains, would be more cautious around him. And he might attract new allies who want to be on the side of someone with such a powerful weapon.
His relationship with his friends on the surface world would likely become strained. They might not understand why he chose to live in the underworld or be afraid to visit him there. But with some, like Annabeth, she might be determined to visit and support him no matter what.
If Percy is the son of Hera and Chaos, his relationships will be turned upside down. His interactions with the campers at Camp Half - Blood would be full of tension. They would be curious yet afraid of him. His relationship with the gods would be a mess. Hera, who is not known for her motherly love, might still have some sort of strange bond with him, but it would be nothing like a normal mother - son relationship. And the other gods would view him as an anomaly. His relationship with his enemies, like the Titans or the Giants, might also change. They could see him as either a potential ally or a greater threat than before, depending on how they perceive the power of Hera and Chaos combined.