One great Percy (as Kronos' brother) fanfiction could be one where he tries to change the fate of the Titans. He might use his unique connection to Kronos to broker peace between the Titans and the Olympians. This could involve a lot of political intrigue within the divine families.
In some fanfictions, Percy as Kronos' brother is in a love triangle. He is caught between his loyalty to Kronos and his growing feelings for a certain demigod. This creates a lot of internal conflict for Percy and drives the story forward in a really engaging way.
Yes, there are likely some fanfictions out there with this concept. The Percy Jackson fandom is quite large and creative, so it's possible for fans to explore such an interesting and unorthodox relationship in their stories.
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 interesting fanfiction could be where Female Percy struggles with her identity as Kronos' daughter. She might have to battle against the dark nature she inherits while trying to uphold the values she learned from her friends at Camp Half - Blood. For example, she could be in a situation where she has to choose between following Kronos' old plans for domination or forging her own path of peace.
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.
Well, for 'percy x kronos fanfic', there are some really creative ones out there. Some focus on a world where Kronos is redeemed in part because of Percy's influence. In these fanfics, the authors often play with the idea of fate and how two such opposing characters could come together. For example, in 'A New Beginning', it shows Percy trying to understand Kronos' past and how that could lead to a different future for them both.
I'm not sure of a specific title, but in general, these types of fanfictions often explore how being Kronos' daughter would make her an outcast among the other demigods. They might also show her coming to terms with her father's actions and trying to make a name for herself separate from his dark legacy. You could search on popular fanfiction sites using relevant tags like 'fem Percy', 'Kronos' and 'daughter' to find some good reads.
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.
In many fanfictions, Percy might use his water powers in a unique way. Maybe he combines his control over water with his sword fighting skills. He could create a giant water vortex to disorient Kronos and then strike with Riptide while Kronos is off - balance.
Power and its consequences are also a big theme. Percy having a connection to Kronos means he might inherit some of his power. Fanfictions often explore how he deals with this power, whether he uses it for good or is corrupted by it.
Luke could also be a prominent character. Since he has a complex relationship with Kronos in the original story, in fanfiction he could play a role in either helping or hindering fem Percy's efforts against Kronos. Nico di Angelo is another possibility. His powers over the dead could be useful in a fight against Kronos, and he might team up with fem Percy for that reason.