One interesting plot could be Percy's internal struggle with his new identity as the child of Kronos. He might battle against the dark urges that come with his heritage while trying to stay true to his friends at Camp Half - Blood. Another plot could involve Percy facing off against the other demigods who see him as a threat due to his relation to Kronos.
Another plot might be a scenario where Percy tries to reason with Kronos. He could attempt to understand Kronos' motives for wanting to destroy the Olympians and find a compromise. This would be a complex and emotional journey as Percy has to face the being who nearly destroyed his world.
One interesting plot could be Fem Kronos trying to manipulate Percy in a more complex way than in the original stories. Maybe she uses her charm as a female figure to deceive him into doing things that would benefit her ultimate goal of ruling. Another plot might involve Percy having to face his own inner demons when dealing with Fem Kronos, as she represents a different kind of threat compared to male Kronos. And there could be a plot where Fem Kronos teams up with some other minor gods or creatures who have grudges against the main Olympian gods, and Percy has to stop their combined forces.
Percy is the central figure, no doubt. But also, there could be other characters like Grover. Grover would be in a difficult position as Percy's friend. He would want to support Percy but also be cautious because of Percy's connection to Kronos. Additionally, some new characters might be introduced, perhaps other children of Kronos or characters from Kronos' past who have a role to play in Percy's story.
Well, perhaps a plot where Percy has to enter Kronos' old lair to find a way to break a curse that is affecting his friends. He could face many challenges and traps there. Also, a plot where Percy discovers that Kronos had a secret plan that he now has to carry out, but it conflicts with his loyalty to the Olympians.
A possible plot is that fem Percy is sent on a quest that is somehow related to Kronos. Along the way, she discovers secrets about Kronos' past that she can use to her advantage. She might also meet characters who knew Kronos before he became the big bad, and these characters help her in her fight against him. For example, she could find an ancient weapon that was once used against Kronos and learn how to wield it effectively.
The character development of Kronos is also important. Fanfic writers often explore his past and what led him to become the villain he is. They might give him more complex motives, like a desire for revenge that goes beyond just power. Also, the relationships between the characters, like Percy's relationship with his friends in the face of Kronos' threat, are key elements. In some fanfics, these relationships are tested and strengthened in different ways.
In a fanfic scenario where Percy Jackson joins Kronos, it could be a very interesting exploration of the 'what - ifs'. Percy has a strong sense of justice, so for him to side with Kronos, Kronos must have presented a very convincing argument. It could be that Kronos showed Percy a future where the demigods are constantly oppressed by the Olympians. However, this would also mean Percy has to go against his instincts and the relationships he has built. His friends like Annabeth would be in shock and try to bring him back to the right side. This could lead to some intense battles not only between the demigods and Kronos' forces but also within Percy himself as he struggles with his new allegiance.
One idea could be Percy having to face Kronos in a dream realm where Kronos tries to manipulate his mind. Maybe Kronos shows Percy a false future where his friends turn against him to make Percy doubt his alliances.
Well, a cool plot could be that Percy, as the General of Kronos, discovers a hidden power within Kronos' forces that could either save or destroy the world. He then has to race against time to figure out how to control this power. Also, there could be a sub - plot where Percy is constantly in conflict with his old Percy Jackson values while leading this new role. Maybe he has to find a way to reconcile his past self with the General he has become.
One idea could be that Fem Percy has a unique connection to Kronos. Maybe she can see into his past and uses that knowledge to try and prevent his rise. For example, she discovers a long - forgotten weakness of his from his early days. Another plot could involve Fem Percy being tricked by Kronos into doing his bidding at first, but then realizing his true evil nature and turning against him. This could lead to an intense battle of wills between them.