The plot could revolve around Percy discovering his relation to the Fates and the implications it has on his life. He could be given tasks or missions by the Fates that are crucial for the survival of the demigod world. It might also mean that other characters view him differently, either with fear or awe, because of his new - found connection to such powerful entities.
Well, it could involve Percy having some sort of special connection with the Fates. Maybe he can influence destiny in ways others can't. For example, he might be able to change the fates of his friends in dangerous situations, like when they're facing a powerful monster. This would make for an interesting dynamic as he'd have to balance the power he has with the natural order of things.
In a Percy Jackson becomes a goddess fanfiction, the story could start with some sort of magical accident or a powerful spell that turns him into a goddess. As a goddess, Percy would have to adapt to a whole new way of life. He'd no longer be just a hero on quests but a divine being with a different set of rules. His powers would likely be enhanced, and he might gain abilities like shape - shifting or more powerful control over water. His journey would involve not only coming to terms with his new identity but also using his new powers to protect the world in a different way than he did as a demigod.
It could involve Percy facing new challenges related to the concept of balance. Maybe he has to deal with a Titan who is disrupting the natural order. For example, the Titan might be causing chaos between the mortal and the demigod worlds, and Percy has to find a way to stop it.
Well, it could have a plot where Percy discovers his connection to Kaguya through some ancient prophecy. Maybe there are special powers he gains from this heritage that he has to learn to control while still dealing with his regular demigod stuff like fighting monsters and going on quests.
One possibility is that Percy's new status as the adopted son of Ouranos gives him unique powers. He might be able to control primordial elements like the very essence of the sky and space. For example, he could create storms on a much larger scale than before, drawing power from the origin of the heavens. Another aspect could be his relationship with the other gods. They might view him with a new level of respect or fear, which would change the power dynamics in the demigod world. And Percy would also have to deal with the expectations and responsibilities that come with being related to such a powerful primordial being.
Well, it could be about Percy discovering he has this unexpected connection to Ares. And then he has to deal with the reactions of his friends like Annabeth. Some of them might be distrustful of this new relation. Percy would then try to find out more about his connection to Ares through exploring old prophecies and ancient sites, all while trying to keep his regular demigod duties in check.
Well, one possible plot could be Percy and Zoe having to team up against a common enemy. Maybe a new powerful monster emerges that neither of them can defeat alone. So, they have to put aside their differences (if any) and combine their skills. Percy with his water powers and Zoe's archery skills would make a great team. They could start out not trusting each other much, but as the story progresses, they learn to rely on one another and form a strong bond.
Well, one possible plot could be Percy discovering he's Zeus' brother in a very unexpected way. Maybe through some ancient prophecy that was long forgotten. He'd then have to deal with the power struggles within the Olympian family, as well as his own identity crisis. Another aspect could be his relationships with other demigods changing, as being related to Zeus is a huge deal.
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 discovering his connection to Achilles while on a new quest. Maybe he has to face a powerful enemy that only his newfound link to Achilles can help him defeat. For example, he might gain some of Achilles' combat skills or invulnerability in certain situations.
The fanfiction could revolve around the origin of Percy's brother's space powers. It might be that he was experimented on by some dark force in the past which gave him these powers. Percy and his friends then have to find a way to reverse or control these powers before they go out of hand. The brother could accidentally be creating black holes or warping the demigod world with his unstable powers, and Percy has to use his own skills and the help of the gods to save the day.