If Percy becomes Chaos, his character development would be extreme. He'd go from a hero among demigods to a cosmic entity. His sense of self would be challenged. He may forget his human side over time. His actions would be based on the greater good of the cosmos, which could mean sacrificing things he once held dear. He'd have to learn to control his new powers without causing chaos (ironically) and find a new place in the grand scheme of things.
Percy's character would evolve into a more solitary figure. As Chaos, he'd be in a realm where few can understand him. He might struggle with loneliness, yet at the same time, he'd be filled with a sense of purpose that is much grander than his previous quests. His loyalty would shift from his friends on Earth to the well - being of the entire universe.
He would likely become more independent. As the son of Chaos, he'd realize that he doesn't fit neatly into the existing demigod hierarchy. This would make him more self - reliant. He might also become more mysterious, as the powers of Chaos are not fully understood by others.
He would likely become more introspective. With the ability to see through time, he'd reflect on his past actions more deeply.
Percy would likely become more powerful and confident. As the 'husband of chaos', he would be exposed to new levels of magic and strength. His decision - making skills would also be sharpened as he has to deal with the unpredictable nature of the chaos realm.
His character would likely become more unpredictable. He'd start to break free from the conventional moral and ethical constraints he once had. This doesn't mean he'd become evil, but rather that he'd view things from a different perspective. For example, actions that were once considered wrong in the context of order, might seem necessary in the chaos he now commands.
He would become more confident. Having the power to control elements gives him an edge. He would no longer be just a demigod with limited powers but a force to be reckoned with.
His character could develop in terms of his understanding of the divine world. Since he's with a goddess, he'd get a closer look at how the gods operate, their politics, and their values. This would make him more aware of his place in the grand scheme of things, not just as a demigod but as someone with a connection to a powerful goddess. He might also become more diplomatic as he tries to navigate the complex relationships within the divine realm.
His character would likely become more hardened. The military life is tough and Percy would have to face a lot of difficult situations. He might become less trusting at first as he'd be in a new environment full of strangers. But over time, he could learn to rely on his new comrades. Also, his sense of responsibility would expand from just protecting his friends and family to protecting his entire unit and his country in the context of the fanfiction.
Her character would be different in several ways. Physically, she'd face different challenges. For example, if there are tasks that require a certain level of physical strength that were easier for male Percy, female Percy might have to find alternative ways to overcome them. Emotionally, she could be more empathetic. Since society often expects girls to be more nurturing, she might show more concern for the well - being of others. This could also change her leadership style. Instead of a more authoritative leadership, she might lead by example and through building consensus. And her sense of identity would be more complex. She'd have to balance being a girl with being a demigod, which could lead to some interesting internal conflicts.
Percy becomes more powerful and confident. As the Brother of Chaos, he has access to greater powers, which changes his self - perception. He also becomes more independent as he's no longer just a demigod within the camp's structure.
Percy's character would likely become more hardened. Living in Tartarus, he'd face constant danger and that would make him more cautious and strategic. His sense of survival would be enhanced.