Well, in some 'Percy Jackson brainwashed fanfiction', Percy might be brainwashed by a siren - like creature. The siren uses its powers not just to make Percy fall in love with it, but also to make him do its bidding. His friends would then have to find a way to reverse the brainwashing. In other cases, Percy could be brainwashed by a spell from an ancient magic book that a rogue demigod found. This could lead to Percy being made to fight against Camp Half - Blood until someone figures out how to break the spell from the book. There are also stories where Percy is brainwashed by a god who wants to use him for a personal vendetta against other gods, and Percy has to fight against the god's control.
One could be a story where Percy is brainwashed by a new, mysterious villain into believing his friends are his enemies. He starts to act against them until Annabeth manages to break the spell through their strong bond. Another might involve Percy being brainwashed to forget his demigod powers and live as a normal mortal, only to gradually regain his memories in a series of strange encounters. And there could also be a fanfic where Percy is brainwashed by a powerful magical artifact to serve an evil purpose, but he resists subconsciously and that leads to an internal struggle within him.
One interesting fanfiction could be about Sally's early adventures before Percy was born. It might explore her relationship with Poseidon in more depth. Another could focus on a day in the life of Sally and Percy when they have a special family event, like a reunion with other demigods at Camp Half - Blood. And there are also fanfictions that rewrite certain events from the original series with a different perspective from Sally's point of view.
Well, in these fanfics, the concept of being brainwashed can work in various ways. Sometimes, it's through the use of enchanted objects. For instance, if Percy touches a cursed sword, it could start to influence his mind, making him do things he wouldn't normally do. Other times, it could be a mental attack from a telepathic enemy. They might invade Percy's mind and plant false ideas or commands. And in some cases, it's a more insidious form of brainwashing where the character is slowly influenced over time by a seemingly friendly but actually evil force, like a new 'friend' at Camp Half - Blood who is secretly a minion of a dark power.
One interesting 'Percy Jackson Lovecraft fanfiction' story could be one where the dark and mysterious elements of Lovecraft's universe blend with the demigod world of Percy Jackson. For example, a story where the Old Ones start to influence the dreams of the demigods, leading to strange and dangerous adventures. It could show Percy and his friends having to deal with new, otherworldly threats that are a cross between the eldritch horrors of Lovecraft and the mythological beasts they are used to.
In a particular 'Percy Jackson faints' fanfiction, Percy faints after being poisoned by a strange and rare plant in the Underworld. His friends then have to race against time to find an antidote. This creates a lot of tension and drama as they search through different realms and face various challenges to save Percy.
In some fanfiction, Percy might get transported to a different time period. Imagine him in ancient Greece, before the gods had fully established their current rules. He would have to navigate this world without the knowledge and support systems he's used to, and it would be really cool to see how he adapts and changes the course of events there.
One interesting Prince Percy Jackson fanfiction could be one where Percy discovers he has royal blood from an ancient underwater kingdom. In this story, he has to balance his normal demigod duties with the new responsibilities of being a prince. Maybe he has to attend grand underwater ceremonies and deal with court politics while still trying to save the world from monsters.
In some 'Percy Jackson texting fanfiction', the demigods use texting to communicate across different camps. Percy might be texting Thalia from Camp Half - Blood to Camp Jupiter. They talk about the differences in their training methods and share stories of their heroic deeds. There could also be a plot where a new demigod is introduced through texting. The other demigods start getting strange texts from an unknown number, and it turns out to be a new recruit who needs their help.
Well, in some fanfictions, the eldritch elements might be merged with the Greek mythology in the Percy Jackson world. For example, an eldritch entity could possess one of the gods, and Percy has to figure out how to save the day. He might have to team up with his friends and face not only the power of the possessed god but also the unfathomable nature of the eldritch being. It could be a really exciting and unique take on the Percy Jackson universe.
There might be a fanfiction where Demeter takes Percy under her wing to teach him about nature magic. In this story, Percy discovers new powers related to plants and the earth. He could use these powers to fight off enemies in a more unique way compared to his usual water - based powers. It would be a great character - development arc for Percy.
A great Percy Jackson mana fanfiction could be about a new character who has the power of mana and enters the Camp Half - Blood. This character brings a new dynamic as they try to teach the demigods about mana and how it can be used in combination with their existing powers. The story could explore the clashes and friendships that form as a result, and how they all work together to face new threats with this added power source.