In such a fanfiction, Percy's character would be in a constant state of turmoil. He's in an unthinkable situation, but he has to make the best of it. He would start to question his own identity and what it means to be a hero. However, as he navigates this new role, he could emerge as a more complex and nuanced hero. He might develop new powers or skills as a result of his connection to Kronos, which he could then use against him. His moral compass would be put to the test, and through this trial, he could become a stronger and wiser version of himself.
His character could develop in a way that he becomes more powerful. Since Kronos is a very powerful being, Percy might inherit some latent power. But he would have to learn to control it. He would also become more empathetic towards the Titans in a sense, as he realizes that Kronos is his brother. This could lead to him trying to find a middle ground between the Titans and the gods, which would be a major shift in his character from just being a defender of the gods.
Well, Percy's character would go through a major transformation. Initially, he would be shocked and confused about being the son of Kronos and Gaea. This would cause him to reevaluate his relationships with his friends and allies. He may feel isolated as he believes they might not accept him anymore. As he delves deeper into his heritage, he would learn about the history and motives of Kronos and Gaea. This knowledge would give him a different perspective on the world of gods. He would have to make tough decisions, like whether to use the powers associated with his parents for good or evil. Through these experiences, he would become a more self - aware and morally complex character, no longer simply the hero who always follows the Olympians' rules but someone who has to make his own path based on his understanding of his true identity.
To develop the character, start with his backstory. Since he's the son of Kronos, he might have grown up in a very different environment compared to other demigods. Maybe he was hidden away by a minor god who felt sorry for him. His past experiences of being alone and shunned because of his father would shape his personality, making him a bit of a loner at first.
Their relationship could start with Kronos trying to manipulate the female Percy. But as she gets to know him through their interactions (maybe in dreams or through some magical connection), she starts to understand his motives, which were once noble but got corrupted. She might then try to reform him.
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.
Percy would likely become more confident. Killing Gaea, a powerful primordial goddess, would be a huge accomplishment. He'd probably have more respect from the other demigods and gods. His self - belief would soar as he realizes he can overcome the most difficult of challenges.
He would become more cautious. Losing an eye would be a harsh reminder of his mortality. He'd likely train harder to make up for the loss of vision in one eye. For example, he might practice more with his sword in the dark to get used to fighting with limited sight.
After absorbing Kronos, Percy's character could develop in several ways. He could become more confident in his abilities due to the extra power, but also more cautious as he realizes the potential danger of what he's absorbed. His relationships with his friends and family might change. He could become more of a loner as he tries to figure out how to control the new power and keep it from corrupting him. His sense of responsibility might also grow as he now has the power to cause great harm or do great good.
Percy would likely become more conflicted. His previous identity as the son of Poseidon shaped his values and actions. But as the son of Kronos and Rhea, he'd have to reevaluate everything. He might become more cautious, as he now represents a more controversial lineage.
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.