It could also be a story that delves into Percy's past. There might be some events from his childhood or early days that he has never shared. The fanfiction could be a creative exploration of those untold stories, including his relationships with his family or how certain experiences shaped him into the person he is now.
Perhaps it's a fanfiction where Harry has a secret love affair with a character that was not explored in the official books. For example, a relationship with a foreign exchange student from another magic school. In this fanfiction, they might be sharing secret glances and having midnight rendezvous in the Forbidden Forest. It could add a whole new layer of drama and romance to the Harry Potter universe.
Perhaps the plot could involve Percy's daughter discovering her true identity on her own. She might start to notice strange things about herself or her father's behavior. For example, she could find some old letters or artifacts that hint at her origin. And as she digs deeper, she gets closer to the truth, which also brings her closer to the dangerous world her father has been shielding her from.
It could be a mark that represents his family or a long - lost heritage. Perhaps it's a crest that has been passed down through generations in his family but he has to keep it secret for some reason, like it might draw unwanted attention from certain enemies or factions in the story.
Maybe Percy's secret talent in fanfiction could be that he has the ability to communicate with sea creatures on a much deeper level than shown in the original story. He can not only understand their simple messages but also have complex conversations with them, getting valuable information about hidden treasures or upcoming threats in the ocean.
It could be some personal achievements that the person doesn't want to share publicly yet. For example, getting a job offer but waiting for the right time to announce.
Perhaps the fanfiction's plot involves Percy secretly being part of a prophecy that the gods are trying to keep hidden from the demigods. This could lead to him having to make some tough choices between his loyalty to his friends and his new - found secret destiny.
It could be a character completely made up for the fanfiction. A young girl named Elara who has the power to communicate with animals. She and Percy met in the forest, and they kept their relationship a secret because Elara's power is seen as a threat by some in the story's world.
One possible theme could be friendship. Despite their different backgrounds and powers, they come together. Percy from Camp Half - Blood, Thalia as a daughter of Zeus, and Nico with his connection to the underworld. Their friendship could be tested and strengthened throughout the story.
It could be about a hobbit's hidden adventure that was not part of the original story. Maybe the hobbit discovers a magical artifact in a forgotten corner of Middle - earth and has to keep it a secret while trying to figure out its power.
Perhaps it's a story where Lucy is in love with someone she can't be with publicly. So she writes this secret fanfiction to express her feelings and desires about that relationship.