One common plotline is Percy using his demigod powers in a secret agent - like mission. For example, he might use his ability to control water to infiltrate a secure location near a body of water. Another is Percy teaming up with other demigods as a secret agent squad to take on a new threat to the demigod world that has a more modern, espionage - like feel.
Another possibility is that Percy is recruited by a secret organization that has discovered his demigod powers. They see his potential as a secret agent because of his combat skills, quick thinking, and ability to adapt in dangerous situations. In this fanfiction, he might have to work with other agents who are initially skeptical of his 'weird' powers but soon come to respect and rely on him.
One possible plot could be that Percy and Annabeth are secretly recruited by the gods to be agents in the human world. They have to use their demigod powers and skills to stop a powerful ancient evil that is using modern technology to cause chaos. For example, a Titan might be using the internet to spread misinformation and create unrest among mortals. Percy could use his water - controlling powers to deal with any threats related to water systems, like floods created to disrupt cities. Annabeth, with her strategic mind, would be planning their every move and deciphering the Titan's plans hidden in ancient texts that have been digitized.
There's also 'Secret Agent Percy'. It was interesting how Percy was paired with a mortal agent who didn't believe in the supernatural at first. As they worked together on the mission to stop a group of rogue demigods from starting a war, the mortal agent gradually came to accept Percy's powers. It had a great mix of action, humor, and character development.
One common plotline could be Percy trying to control and lead the werewolf packs. Since he's the God of Werewolves, he might have to deal with internal power struggles within the packs. Another plotline could be Percy facing off against other gods who are threatened by his new role and the power it gives him over a new group of creatures.
Often, there's a plotline where the curvy woman has some special power that Percy needs to help her control. This leads to them getting closer as they train together. Also, some fanfictions have a plot where they are on a quest to find a lost artifact, and during the journey, their relationship deepens. There are also plotlines where the curvy woman is a seer, and she foresees some danger that Percy and his friends must face.
One common plotline is Percy finding out that the Olympians have been using him all along. For example, they might have sent him on dangerous quests not just to save the world but also to gain more power for themselves. Another could be Percy being betrayed by a close friend or ally who is working for the Olympians' self - serving plans. Maybe they set him up to take the fall for something he didn't do.
One common plotline could be Percy struggling to adjust to his new role as the King of Hell. He might face opposition from the existing denizens of Hell who don't want a new ruler.
One common plotline is Calypso seeking revenge against the gods who trapped her on the island. This gives her a more assertive role compared to the original story. Another is her trying to find a new place in the world of demigods after being freed.
Many fanfictions also have a plotline where Percy as the God of Tides has to deal with the consequences of his new power. He might accidentally cause a natural disaster due to his inexperience with his godly abilities. Then, he has to find a way to fix it while also facing the wrath of the other gods who are angry about the disruption he has caused.
One common plotline is Percy struggling to control his new powers as the God of Chaos. He might accidentally cause chaos in places he doesn't mean to.