Well, it could vary a great deal. Some fanfictions might focus on Percy leading a new group of demigods in a resistance against an emerging threat, perhaps a new and more powerful enemy than the Titans or Giants. Maybe it involves a fight against a corrupt part of the Olympian council. It really depends on the creativity of the fanfic author.
Definitely Percy Jackson. He's the central figure in the Percy Jackson universe. Alongside him, there could be new characters created specifically for the fanfiction. But we can also expect to see some of the other well - known demigods like Nico di Angelo. Nico's powers and his complex personality would make him a great addition to a resistance - themed story. And of course, there would probably be some of the gods or goddesses who play a role, either as allies or antagonists.
One possible plot could be that the entire Greek pantheon is thrown into chaos. Percy might be seen as a huge threat, and other gods and goddesses would either try to hunt him down or form alliances with him out of fear or a desire for power. Demigods would be forced to take sides, leading to massive battles among them.
One possible plot could be that a powerful enemy, let's say a dark sorcerer, has found a way to use the powers of the Greek gods against the supernatural beings in the Mikaelson universe. Percy Jackson is sent to investigate and ends up getting caught in the middle of the Mikaelson family drama. He has to use his skills as a demigod and his knowledge of Greek mythology to help the Mikaelsons defeat this new threat while also trying to keep his own identity and mission a secret from some of the more untrustworthy members of the family.
The plot might involve Percy getting lost in Alagaesia. He then has to figure out how to get back home while also getting involved in the local politics and power struggles. Since he's a demigod, he might be seen as a powerful ally or a threat. He could end up using his knowledge of Greek mythology and his own powers to outwit the various factions in Alagaesia.
Well, in many fanfictions, Percy might be on a mission to assassinate some powerful being in Tartarus. Maybe he has to face all kinds of hellish creatures and overcome insane challenges. It could involve him using his water powers in unique ways, like creating weapons out of water to fight the demons of Tartarus.
Maybe Percy Jackson somehow gets transported to the world of Stranger Things and has to fight the Demogorgon. He could use his water - controlling powers to try and defeat it, like dousing it with a powerful stream of water.
The plot might involve the forbidden warrior having some special powers or abilities that Percy has to figure out how to work with. It could be that the warrior was once banished or exiled for reasons that are gradually revealed. And Percy, being Percy, gets dragged into the whole situation, and they embark on a journey full of challenges and self - discovery. Along the way, they might encounter other mythical creatures and have to use their combined skills to overcome obstacles.
A great plot could be Percy being sent on a top - secret mission by the army. This mission could be related to some ancient artifact that has military applications but also ties to his demigod world. Along the way, he meets other demigods who are also in the military for various reasons. Together, they have to overcome not only military enemies but also mythical creatures that are after the same artifact.
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.
Well, in a 'Percy Jackson Endgame' fanfiction, the plot might involve Percy finally having to make a huge sacrifice to save not just the demigod world, but the entire mortal world as well. The other characters like Annabeth, Grover, and the rest of the gang would be trying to find an alternative solution while Percy is ready to give it all up. It could also include a race against time as some sort of dark prophecy looms over them.