One idea could be her going on a quest to find a lost trident piece that was stolen by a powerful new enemy. This would involve facing various mythical creatures and using her unique powers as Poseidon's daughter.
She could be sent on a mission to help a coastal town that is being terrorized by a sea monster. Along the way, she meets other demigods who don't believe she's really Poseidon's daughter at first. So she has to prove herself and also figure out how to defeat the monster in a way that doesn't cause too much destruction to the town.
One idea could be Percy having to face a new threat underwater that only Poseidon can help him understand. Maybe a lost civilization that Poseidon once had a connection with is now causing trouble. Another could be Percy going on a quest to find a powerful artifact that was once Poseidon's but has been stolen, and Poseidon gives him special powers or guidance along the way.
A really interesting plot could involve her exploring a new part of the ocean that has been hidden for centuries. In this journey, she might encounter new sea deities that Poseidon has never mentioned. She could also find herself in a conflict between two groups of sea - creatures, and she has to use her wits and powers to bring peace. Along the way, she could learn more about her father's past and secrets that he has been keeping from her, which could change her relationship with him and her view of herself as a demigod.
One idea could be Percy as a baby having small adventures in the underwater world of Poseidon. Maybe he befriends a baby sea monster. Another could be Poseidon trying to protect baby Percy from the other gods who are suspicious of this half - god baby.
Maybe Percy discovers a prophecy that involves both his father Poseidon and Lupa. He has to journey to different realms under the sea and in the Roman wolf - related places. Along the way, he meets new demigods and creatures that either help or hinder him in fulfilling the prophecy.
One interesting plot idea could be Percy having to team up with a demigod child of Leto. They could go on a quest to find a long - lost artifact that has the power to restore balance between the sea and the moon's influence. Since Percy is the son of Poseidon, his control over water and the other demigod's connection to Leto's lunar powers would create a unique dynamic.
One interesting plot idea could be Percy having to deal with the conflicting natures of his 'parents'. Since Gaia represents the earth and Poseidon the sea, he might struggle with controlling both earth - related and sea - related powers. For example, when he's near a beach, he could accidentally cause small earthquakes or make strange things happen to the sea life. Another plot could involve Percy facing a threat that only his unique dual - heritage can defeat. Maybe an ancient evil that is both of the land and the sea, and Percy has to figure out how to combine his powers in a new way to stop it.
One idea could be Percy having to face a new and powerful sea monster that is awakened by an ancient curse. He'd have to use his powers in unique ways, maybe even discovering new abilities as the son of Poseidon. Another could be Percy traveling to a long - lost underwater civilization that has a connection to his heritage as an ancient son of Poseidon.
One idea could be Percy going on a quest that involves uncovering a long - lost secret about his connection to Poseidon that even the gods don't know. Maybe it's a hidden power that only surfaces when he faces a certain kind of threat. Another plot could be Percy having to deal with the jealousy of other demigods because of his special status as Poseidon's son. They might try to undermine him during a crucial mission, adding lots of drama and conflict.
One plot idea could be that the fem Percy Jackson discovers a hidden underwater realm ruled by Poseidon that no one else knew about. She has to navigate through its mysteries and face challenges specific to that place, all while having a complex relationship with Poseidon that develops into a lemon - themed encounter in a very unexpected way. Maybe there are unique sea creatures there that play a role in their relationship development.
Perhaps in the fanfiction, there could be a prophecy that involves Percy, Zeus and Poseidon. The prophecy states that only when the three of them perform a certain ritual together can they prevent a great disaster. But the ritual requires them to put aside their differences and trust each other completely. Percy has to convince the two powerful gods to participate.