Well, it depends on the specific fanfiction. There are countless fan - created stories out there, and some might indeed choose to portray Percy Jackson as a devil for the sake of a unique or edgy plot. However, in the mainstream Percy Jackson lore, he has no such association. So while it could be a thing in certain fanfictions, it's not a common or canonical representation.
No, Percy Jackson is a hero in the original series. However, in fanfiction, different writers can have their own interpretations. But it's quite a stretch to make him the devil. Fanfiction sometimes just likes to play with extreme ideas to create shock value or new plotlines that deviate from the source material.
There could be new characters as well, like a devil mentor figure who teaches Percy about his devil heritage. This character could be ancient and have a lot of knowledge about the devil realm. Or there could be an angelic character who is initially an enemy but later realizes Percy is not fully evil and they end up forming an unlikely alliance.
Obviously, Percy Jackson himself is usually a main character. He is the one who gets involved in the devil - related situations. And then there could be new characters created specifically for the fanfiction, like a devil - like antagonist who is trying to corrupt Percy or the world around him.
Yes, often in such fanfictions, the plot can be quite engaging. The devil concept can be integrated in various ways. It might involve Percy being lured into a dark underworld ruled by a devil figure, and he has to use his wits and demigod powers to navigate through it. Maybe he discovers some dark secrets about his family or the gods that are connected to this devilish realm.
Some fanfiction writers may do it to stand out. Since the Percy Jackson series is so well - known, creating a version where he is a devil can attract attention. Also, it could be a way to explore darker themes. The original series has a lot of heroic and positive elements, but in fanfiction, making Percy a devil allows for a look at the other side of the coin, like how his powers could be used for evil instead of good.
One idea could be Percy using his devilish powers to protect his friends in a unique way. Maybe he has the power to manipulate shadows and uses this to create illusions to mislead enemies.
One interesting plotline could be Percy's struggle with his new identity as the 'Son of the Devil'. He might have to face internal conflicts about his nature. For example, he could be torn between his heroic instincts and the dark powers he may inherit.
There could be a character who is a mentor to Percy in understanding his devilish side. This character might be an ancient being with knowledge of both the divine and the demonic. For example, a fallen angel who has seen the rise and fall of many with such mixed heritages.
The theme of identity is quite common too. Percy is used to being a demigod, but in the Devil May Cry world, he might question who he really is. Is he still just a demigod, or is he becoming something more like a devil hunter? And how does his identity as a son of Poseidon play out in a world where the power of the sea might not be as relevant as it is in his own world? Fanfic authors often play with these questions, creating stories that are not only action - packed but also thought - provoking.