Perhaps the story could be about Percy's struggle to be accepted in both Poseidon's and Hera's domains. He might face discrimination from some of the sea creatures loyal to Poseidon who don't trust his connection to Hera. At the same time, the followers of Hera might see him as an outsider. Percy then has to prove himself worthy in both worlds. He could start by performing heroic deeds in Poseidon's underwater kingdom and then move on to solve a big problem in Hera's realm, like stopping a curse that is affecting her favorite city or something.
The plot could involve Percy being sent on a quest by Hera. Even though she is not his mother in the traditional sense, but because of his relation to Poseidon. On this quest, he might encounter monsters that are specifically sent by other gods who are against the idea of Percy having such a unique parentage. Percy could use his powers from Poseidon to overcome these challenges while also trying to figure out Hera's true motives for sending him on this dangerous mission.
One possible plot could be Percy having to deal with the complex relationship between his two divine parents. Since Poseidon and Hera have their own rivalries and power dynamics in Greek mythology. Maybe Percy discovers some long - hidden secret about their relationship that puts him in the middle of a big conflict among the gods. For example, a prophecy might be revealed that Percy is the key to either mending or worsening the relationship between Poseidon and Hera. And he has to make choices that will not only affect his own fate but also the balance of power among the gods.
A great plot could revolve around Percy's role in the power dynamics among the gods. As the son of Hera and Poseidon, he has the potential to shift the balance. Some gods might try to use him as a pawn, while others see him as a threat. Percy would then have to navigate this complex political situation among the gods while also dealing with his own personal growth and the challenges that come with being a demigod.
One interesting fanfic could be where Percy has to deal with the complex politics of having two powerful parents. He might struggle to find his place among the demigods who have more traditional parentage. For example, some might be jealous of his unique heritage, while others might fear his potential power.
A plot idea might be that Percy is magically transported to a time when Poseidon and Hera had a major disagreement in the past. He has to use his wits and powers as Poseidon's son to prevent this rift from growing and causing chaos in the present. Also, he could be given a task by Hera to rescue one of her favored heroes who has been trapped by a sea monster under Poseidon's domain. This would put Percy in a tricky situation where he has to balance his loyalty to his father and the task given by Hera. He might also encounter a group of demigods who are descendants of both Poseidon and Hera in some way, and together they have to face a common enemy.
One common theme is identity. Percy would constantly be trying to figure out who he is with such an unusual parentage. Another theme could be power struggles. Given that Hera and Poseidon are both powerful gods, Percy might face challenges from various forces who either want to use his power or are threatened by it.
The plot might involve Percy trying to bring peace between Poseidon and Athena. There could be some ancient feud between them that Percy is determined to end. He could start by finding common ground between the two deities in their respective domains, like the sea and wisdom. Along the way, he would face many obstacles, including other gods and goddesses who don't want the peace to happen.
One possibility could be a story where Percy and Artemis have to team up for a quest. Maybe there's a new threat to the world of the gods and their combined powers are needed. Percy's skills as a son of Poseidon in controlling water and Artemis's archery and connection with the moon could be crucial in defeating this new evil.
One possible plot could be Percy's struggle to balance his two powerful heritages. He might face challenges from both the forces of Chaos and the underwater world of Poseidon. For example, the denizens of the deep might be wary of his Chaos side, seeing it as a threat to their ordered underwater society. Meanwhile, the chaotic entities could try to pull him fully into their realm, away from his connection to Poseidon.
Well, perhaps the plot involves Percy being hunted by various forces. The Olympians see him as a threat because of his Chaos lineage, and the minions of Chaos might think he's too much of an Olympian. He then has to form an unlikely alliance with some demigods and minor gods who believe in his unique potential. Along the way, he uncovers secrets about the origin of the gods and the true nature of the relationship between Hera and Chaos.
One possible plot could be Percy discovering his true parentage as the son of Amphitrite. He might struggle with his identity, as he has always known Poseidon as his father. This could lead to a journey of self - discovery where he has to learn about Amphitrite's powers and how they are now a part of him.
One possible plot could be Percy's struggle with his dual heritage. He might be conflicted between the gentle, love - associated nature of Aphrodite and the powerful, tempestuous nature of Poseidon. He could be an outcast among both the children of Aphrodite, who are often more focused on beauty and charm, and the children of Poseidon, who are known for their strength and connection to the sea. This internal struggle could form the basis of a great adventure as he tries to find his place in the world of demigods.