The plot might involve Percy's discovery of a hidden power within him. As the brother of Zeus, he has always been in his brother's shadow. But when he uncovers this new power, it changes everything. He has to learn how to control it, and in the process, he may attract the envy or fear of other gods. This could lead to a power struggle within the divine realm.
One possible plot could be Percy, as the brother of Zeus, having to deal with the politics of Olympus. He might struggle to find his place among the other gods while also trying to use his powers for good. Maybe he teams up with some of the younger demigods to bring about change in the rather old - fashioned ways of the Olympian council.
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.
One possible plot could be that Zeus is put in a situation where he has wronged Percy in some way, like falsely accusing him of a crime against the gods. Percy then goes on a journey to prove his innocence and in the process, he uncovers a dark secret about Zeus or the gods in general. This secret is so damning that Zeus has no choice but to bow to Percy in apology and recognition of Percy's integrity. Along the way, Percy might face many challenges, both physical and mental, and the story could explore his growth as a character and his evolving view of the gods.
A possible plot could be that Percy discovers a plot against Zeus by some rogue minor gods. Percy decides to warn Zeus. Initially, Zeus is skeptical but Percy's determination convinces him. They then team up to expose the traitors. Along the way, Zeus begins to appreciate Percy's skills and heart, and Percy gains a new respect for Zeus' wisdom and power.
A fanfic about Percy, brother of Zeus, could start with Percy feeling a sense of isolation. Despite being part of the divine family, he doesn't quite fit in. He decides to leave Olympus for a while and explore the mortal world. There, he experiences the joys and sorrows of humanity in a way that Zeus never has. He falls in love with a mortal, which causes a huge rift between him and Zeus. This love story could be the central theme of the fanfic, with Percy having to choose between his family and his new - found love.
The plot could revolve around Percy's relationship with his divine parents. Since Zeus and Hera have a complex relationship themselves, Percy might struggle with their expectations. Maybe he's caught in the middle of a power struggle between Zeus and Hera's different ideas of how he should use his powers. He could also be trying to unite the camps of different god - related demigods under his leadership as the son of two major gods.
One possible plot could be Percy's journey to discover his true place among the demigods. Since he is the son of Leto and Zeus, he might face unique challenges. For example, he could be caught in the middle of power struggles between different camps of demigods. He may also have to deal with the expectations and rivalries that come with having such powerful parents. His powers, which could be a combination of those associated with Leto and Zeus, might make him a target or a valuable ally.
In this fanfiction, a great plot twist could be related to Percy's origin. What if Percy wasn't really born in the normal way as a god's offspring? He could be a product of some ancient magic that Zeus unknowingly participated in. This revelation could shake the very foundation of the relationship between Percy and Zeus. Also, Percy might discover a hidden side of Zeus' past that Zeus has been trying to keep secret. This knowledge could put Percy in a dangerous position as he decides what to do with this information, whether to expose Zeus or keep it to himself for the sake of their relationship.
Well, it could involve Percy having to deal with the power dynamics of being Zeus' mate. Maybe there are political intrigues in Olympus that Percy has to navigate. For example, other gods might be jealous or have their own agendas regarding this new relationship.
The main antagonists could be some of the more traditional and power - hungry gods. For example, Hera might see Percy as a threat to the order she has maintained for so long. She could try to undermine him at every turn, fearing that his new ideas and his relation to Zeus will disrupt her plans. Another antagonist could be Ares, who might be jealous of Percy's potential power and influence over the other gods and demigods.