Percy could also be forced into changing the past by some external force. For instance, a powerful enemy might manipulate him into going back and undoing a particular event that benefits them. So, he has to figure out how to either resist or work within this new situation.
He might use his powers over water in some creative ways. Maybe he finds a magical spring that has time - altering properties and uses it to travel back and change things.
Reincarnation can completely change the plot. For instance, if a powerful enemy is reincarnated, they might come back with new strategies or alliances. It could turn the tide of a war that was previously won by the heroes.
In this fanfiction scenario, Percy's character change would be quite drastic. He would probably start to embrace the more chaotic and power - centric nature of the Titans. His relationships would be in turmoil. For example, his relationship with Annabeth would be severely tested. He might not value the same things he once did, like friendship and the protection of the camp. His new Titan - influenced self could be more self - serving, seeking to gain as much power as possible and not caring about the consequences for those around him. His values would be realigned with the Titans' more cut - throat approach to power and survival.
If Percy becomes influenced by Kronos in this fanfiction, his sense of morality would be greatly affected. He would probably lose his sense of right and wrong which was a big part of his character before. His loyalty towards Camp Half - Blood and his friends would be in jeopardy. He might start to think that the ends justify the means, which is a very Kronos - like way of thinking. And he could become more aggressive and less patient, as Kronos was always in a hurry to regain his power and rule over the world.
His character might become more aloof. As a primordial god, he would be far removed from the normal world of demigods. He'd likely have a different perspective on things like friendship and loyalty. For example, he might not be as quick to jump into a fight for his friends as he used to be, because his new status would bring a different set of responsibilities.
His personality would likely experience a shift towards a more solemn and responsible demeanor. With godly powers come great responsibilities. Percy would no longer be able to act as carelessly as he did as a demigod. He might become more reserved in showing his emotions, especially as he realizes that his actions as a god can have far - reaching consequences. Also, his loyalty might be tested as he has to balance his new divine status with his relationships from his mortal days.
Well, it would create a huge power vacuum. Ares was one of the major gods, and his death would surely shake up the balance of power among the gods. Other gods might start jockeying for his territory or influence.
He might become more self - reliant. Living in the woods, he has to rely on his own skills to find shelter, food, and water. This could make him tougher both physically and mentally.
His personality would likely become more protective. Since Cerberus is a guardian, Percy might feel an intense need to protect those around him more than ever.
Well, the character development can change a great deal. For one, a female Percy might be more in touch with her emotions. In the original, Percy was a bit of a typical male hero, but as a female, she could show more vulnerability and yet still be strong. For example, she might cry when a friend is hurt, but then use that emotion to fuel her fight against the enemy.
Well, in some fanfictions, it might be related to his demigod powers. Since he has a connection to the water element, blood being a liquid could potentially be manipulated in a way similar to how he controls water. Maybe he can sense the water content in blood and use his will to move or influence it.