Perhaps it could be a vision of the world being completely overrun by the Titans or other powerful enemies and him being powerless to stop it. Percy has always been a hero, and the thought of failing in such a big way could be a terrifying boggart.
The most interesting aspect of Percy's Boggart in fanfiction might be the way it can be used to show his relationships in a new light. Imagine his Boggart being something that represents estrangement from his family. This can lead to stories that focus on his journey to reconcile with them, or his struggle to deal with the fear of losing their love and acceptance, which is really fascinating.
He could use his sense of humor. Just like in the Harry Potter world, laughter can be a powerful weapon against a boggart. Percy has a witty side, so he could crack jokes to make the boggart change into something less scary and then attack it.
If Percy Jackson were to face a boggart in a fanfiction, it could be really interesting. Percy is used to dealing with Greek monsters, but a boggart is a different kind of threat. It takes the form of your worst fear. Since Percy has a lot of fears, like losing his friends or failing to protect his loved ones, the boggart could transform into something really terrifying for him. He might initially approach it like any other enemy, but then realize that it's not as straightforward as slashing it with his sword. He'd have to figure out a different way to defeat it, perhaps using his wits and courage in a new way.
The original concept in the books only gives us a hint of what a Boggart might be for Percy. Fanfiction, on the other hand, can really go wild. For example, in some fanfictions, Percy's Boggart could be a version of himself that has completely turned against his family's values, which is a far cry from the more general idea we might have from the books. It's all about the creative license that fanfiction writers have to take it in different directions.
In some fanfictions, Snape's boggart being his father might be due to the abusive nature of their relationship in the original lore. His father was a Muggle who perhaps made Snape's childhood miserable, so it's a deep - seated fear that haunts him even in fan - created stories.
In fanfiction, Severus Snape's boggart could be the lifeless body of Lily Potter. Since he loved her deeply and her death was a great tragedy for him. It would represent his ultimate fear of losing her all over again, even in the form of a boggart.
Well, through the boggart encounter, they might start with mutual dislike but as they see each other's fears, they could develop empathy. For example, if Hermione sees Draco's fear of his father, she might understand his tough family situation better. This new understanding could lead to a more civil relationship at first, like talking more in the hallways.
In time travel fanfiction, Hermione facing a boggart could be really interesting. Maybe the boggart takes the form of her failing in her time - travel - related tasks. For example, she might be afraid of causing a paradox that destroys the wizarding world she loves.
Often, the Boggart in Draco - related fanfiction serves as a plot device. It can be a way to force Draco into self - reflection. If his Boggart is his father's disappointment, it shows his complex relationship with his family. And this can lead to character growth in the fanfic story.