The plot could involve her on a quest. Maybe she's searching for a way to break the cycle of Kronos' evil. She might team up with Percy Jackson and other characters. They could face various monsters and challenges along the way. And she could be constantly battling her own inner demons related to her father's nature, like a tendency towards power - hunger that she has to overcome.
Well, one possible plot could be Percy having to hide his relation to Kronos while still fighting against the Titans. He might struggle with the internal conflict of having a connection to such an evil entity as Kronos while trying to protect his friends at Camp Half - Blood.
The plot could start with Percy being somehow influenced by Kronos, maybe through a dream or a cursed object. Then he slowly starts to act in ways that are out of character for him. He might begin to gather followers who are also attracted to the power that Kronos represents. Eventually, he could lead an uprising against the gods, believing that he can create a new world order under Kronos's ideology.
One possible plot could be Percy's discovery of his true parentage as the son of Kronos and Rhea. This could lead to a huge power struggle within the demigod world. Other gods and demigods might fear his potential power and try to either eliminate him or recruit him to their side.
A plot could be that Kronos was once a good god but was corrupted by an ancient evil force. Through a series of events in the fanfiction, Percy and his gang find a way to cleanse Kronos of this corruption. Kronos then, in his redeemed state, helps them fight against the remaining threats to the world of demigods. He could use his knowledge of the old times and his powers to aid in battles and also offer wisdom to the young heroes.
The plot could involve Percy being ostracized by the other demigods due to his relation to Kronos. However, he discovers a prophecy that only he, as the son of Kronos, can fulfill. This prophecy might be about saving the world from a new threat that is related to the Titans in some way. He then has to go on a quest to gather ancient artifacts or gain the trust of certain beings to be able to carry out the prophecy.
Well, it could be a story full of internal conflict. As the daughter of Kronos, she might struggle with her dark heritage. Maybe she tries to break free from the expectations of her father's evil legacy. She could befriend the demigods from Camp Half - Blood, but they'd be initially suspicious of her. She'd have to prove herself over and over, perhaps using her unique powers that come from Kronos in a positive way to save the day.
She could potentially have the power of regeneration. Kronos was a powerful being, and if she inherits some of that essence, she might be able to heal from wounds faster than normal demigods. This would make her a very tough opponent in combat as she could keep coming back even after taking serious hits.
One possible plot twist could be that she discovers she's not actually Kronos' daughter. Maybe it was all a big lie or a spell cast by an enemy to make her think she was, and when she finds out, she has to reevaluate her entire identity and purpose. Another twist could be that Kronos was actually good all along, and his actions were misinterpreted. So, she has to fight against the demigods who are trying to stop what they think is an evil resurrection.
One way for Kronos to win in Percy Jackson fanfiction is by spreading more chaos and discord. If he could make the demigods lose faith in the gods and each other, his job would be much easier. He could also try to find a way to use the prophecies to his advantage. Maybe he could twist the words of the prophecies to make the demigods make wrong decisions. And if he could somehow break the connection between the demigods and their godly parents, the demigods would be weaker and he could overpower them.
Perhaps a plot twist could involve Kronos' essence trying to take over Percy's body. Percy would have to fight against this internal takeover, and in the process, he discovers a way to use Kronos' power for good. This would completely change the dynamics of the Percy Jackson universe as we know it, with Percy becoming a sort of anti - hero figure who uses the power of the enemy to protect his friends and the world.