In this fanfiction, it could be that Percy is forced to work for Kronos due to a prophecy. Kronos sees Percy as a valuable asset because of his powers. Percy, while working for Kronos, tries to change Kronos from within. He uses his charm and intelligence to influence Kronos' decisions, trying to steer him away from destruction. But he also faces a lot of internal conflict as he is going against his own principles and the trust of his friends.
One possible plot could be Percy starting off reluctantly working for Kronos. Maybe Kronos has some sort of leverage over Percy, like threatening his friends or family. Percy then has to play a double - agent role, secretly trying to undermine Kronos' plans while appearing to be loyal. He could gather information about Kronos' forces and weaknesses and pass it on to the good guys.
One possible plot could be that Percy discovers his true relation to Kronos early on. This revelation could cause a great deal of inner turmoil as he has to come to terms with being related to the main villain. He might then struggle with whether to side with his friends or his new - found brother, creating a complex moral dilemma.
One possibility is that Kronos captures Percy to steal his powers. Percy, being a powerful demigod, has abilities that Kronos desires for his own evil plans. While captured, Percy may discover some secrets about Kronos' past that could be used against him. He has to use his wits and any small resources he has in the prison to outsmart Kronos and break free.
Some of Kronos' minions, like the monsters he commands, could be antagonists. For instance, the dracaenae. They are always eager to prove themselves to Kronos and might see Percy as competition within Kronos' ranks. They could constantly try to undermine Percy's position and cause trouble for him.
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.
One possible plot could be Percy's journey to discover his true identity as the son of Kronos and Rhea. He might face challenges from the other gods who fear his power. For example, Zeus could try to stop him from fully realizing his potential. Percy would also have to deal with his own internal struggle. He grew up believing he was Poseidon's son, so this new revelation would shake his world. He could start a quest to find out more about his parents' relationship and what it means for him in the grand scheme of the mythological world.
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.
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, in a 'Percy Jackson Seventh Son of Kronos' fanfiction, the plot could center around Percy being hunted by both the gods and the Titans. Since he's the seventh son of Kronos, he has a unique power that both sides want to either control or destroy. Percy has to go on a quest to find a way to neutralize this new aspect of his identity so he can live in peace. Along the way, he teams up with some unexpected allies, like a group of demigods who are also outcasts for various reasons.
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.
Well, perhaps Percy discovers a way to revive Kronos out of desperation to right some past wrongs in the new age. Maybe he thinks Kronos can help against a new, greater threat.