Another possibility is that his secret wife was an ordinary human at first. They fell in love in Percy's early days, before he became well - known. She's kept secret because Percy wants to keep her out of the dangerous world he often finds himself in. For example, she could work in a library, and they have a very normal - seeming relationship in private.
Perhaps Percy's secret wife is actually a shapeshifter. They got married in a very spur - of - the - moment way during a time when Percy was on the run. Their relationship is a secret because she can change her form and they don't want others to use her abilities against them. They have to meet in secluded places where she can be herself without fear of discovery.
One idea could be that Percy is secretly working on a project to reform the Ministry of Magic from within. He might be gathering evidence of corruption in the ministry without anyone knowing. This could add a whole new layer of mystery to his character.
A possible plot for a 'Percy Jackson Secret Power' fanfiction could involve Percy having a secret power of teleportation. But this power is not fully under his control at first. He might accidentally teleport to strange and dangerous places. One time he could end up in the middle of a Titan's lair. As he tries to master this power, he discovers that it has a connection to an ancient prophecy. His friends, like Annabeth, help him figure out how to control it and use it for the greater good.
Perhaps Percy's secret life is that he is a time - traveler. He uses his ability to go back in time to fix mistakes or prevent disasters, but he can't let anyone know as it could disrupt the timeline.
One idea could be a fanfiction where Percy and his friends go on a new quest in a modern, urban setting. Instead of the usual mythological locations, they have to deal with monsters hiding in big cities. Another idea is a story that focuses on the relationships between the characters in a more in - depth way, like exploring the friendship between Percy and Grover during their off - quest times. And a third idea could be a time - travel fanfiction, where Percy gets sent back to the time of the ancient Greek heroes and has to interact with them while still holding onto his modern values.
One idea could be to explore Percy's life after he has fully mastered his powers. Maybe he goes on a quest to find a long - lost relative who also has demigod powers. Another could be a story where Percy and his friends have to deal with a new type of monster that is immune to their usual weapons and they have to find a creative way to defeat it.
You could create a fanfiction where the main character discovers a new, hidden part of Moonacre that was never mentioned in the original story. Maybe it's a magical garden that holds the key to an even greater mystery. This would add a new layer of adventure and intrigue.
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 plot idea could be Percy having to team up with Hera to rescue a group of demigods who have been captured by an ancient monster. Hera, despite her usual aloofness, realizes she needs Percy's unique skills.
Perhaps in the fanfiction, Percy could experience a mental collapse. This could be due to all the pressure and trauma he has faced over the years. His friends might have to find a way to bring him back from this dark place, and in the process, we could see deeper relationships develop among them. For example, Annabeth could use her knowledge and their shared history to reach Percy on a different level.
One idea could be that Percy is framed for stealing a powerful magical artifact. His friends initially doubt him, but as he tries to prove his innocence, he uncovers a conspiracy within the magical community. For example, a secret group wants to use the situation to gain more power and is setting him up as a scapegoat.