One possible plotline could be that Percy has been kidnapped by some mysterious enemy. Maybe it's a new villain who has a vendetta against him. His friends then start a search mission to find him, facing various challenges along the way.
Perhaps Percy discovers a dark secret about his past and decides to disappear on his own to protect his friends. He goes into hiding in a far - off place, but his friends suspect foul play and begin to look for him. As they search, they uncover more secrets about Percy and his family.
Another plotline might be that Jaune is framed for a crime he didn't commit and decides to disappear to clear his name. He goes into hiding and starts his own investigation, all while his friends in RWBY are trying to figure out what really happened and whether he's actually guilty or not.
Well, he might disappear because of a powerful curse from an ancient enemy. Maybe he gets trapped in a different dimension. When he returns, he could have new powers or knowledge. For example, he might have learned some secret magic from the other dimension that helps him defeat a new threat in the Percy Jackson world.
Well, in some 'Hermione Disappears' fanfiction, it might be that she is targeted by a group of anti - Muggleborn wizards. They manage to make her vanish using some dark magic. Her friends, Harry and Ron, then start a frantic search. They might follow a series of mysterious clues she left behind before disappearing. It could also be that a time - traveling mishap causes her to disappear from the current timeline and she is stuck in another era.
One possible plotline could be that Ruby is kidnapped by a powerful new enemy. This enemy might be after her silver eyes power and plans to use it for some evil scheme. Another could be that Ruby accidentally gets transported to another dimension during a battle, leaving her team to search for her.
In the 'Percy Jackson Disappears' fanfiction, perhaps Percy could be kidnapped by an unknown enemy. Maybe it's a new villain who has a vendetta against the demigods. This would lead to his friends, like Annabeth, going on a desperate search for him, facing many dangerous challenges along the way.
Yes, there could be. It might show Percy's struggle against Gabe's abuse. Maybe Percy has no way to escape at first. But as the story progresses, he could find some support from his friends or discover his own strength within to fight back against the abuse, both physically and emotionally.
A plotline could involve Percy being bullied in a mortal school because he seems a bit odd. But then he discovers some ancient secrets that are somehow related to the world he should have been a part of as a demigod. He might start to find allies among some eccentric people who seem to know more about his true nature than he does, and together they uncover a mystery that bridges the mortal and the demigod world in an unexpected way. He has to constantly fight against the limitations of being a mortal while trying to figure out his place in a bigger picture.
Perhaps the horses are in some kind of danger or being mistreated, and Percy, being able to communicate with them, decides to be their savior. He could then embark on a journey to free them or find a better place for them. This would involve facing various antagonists who are against his mission. Along the way, he might also discover some secrets about the horses' origin or special powers that could further the plot.
One possible plotline could be that Luke has been corrupted by some dark force, and Percy has to fight him to save their world. Percy might be reluctant at first because they were once friends, but the greater good forces him into action.
One possible plotline could be Percy finding out he has cancer and having to deal with the reactions of his family. Some might be overly protective, while others might struggle to accept it. Another could be Percy supporting a family member with cancer, showing his growth and change from his more uptight self in the books.