Well, obviously Percy Jackson and Apollo are the main characters. Percy, the demigod son of Poseidon, with his skills in combat and his ability to control water. And Apollo, the god of the sun, music, and prophecy. Their different natures and powers often create interesting dynamics in fanfiction.
Apollo himself is often a great character in these fanfictions. His complex personality as a god who has fallen from grace and is trying to regain his status makes for an interesting read. He brings his godly powers and knowledge of the mythological world.
There are also times when a character who is an outcast within the Apollo cabin is the main character in fanfiction. Maybe they don't seem to fit in because their powers are different from the others, or they have a different view on how the cabin should be run. Their journey to find their place within the cabin and among the other demigods can make for an interesting story.
Percy Jackson is likely to be one of the main characters. And of course, the Singer of Apollo would be a central figure. There may also be other demigods like Annabeth who often accompany Percy on his adventures.
The two central characters are Percy and Apollo. Percy, with his water - based powers and heroic nature, is being trained by Apollo. Apollo, with his vast array of abilities and godly knowledge, is the trainer. There could be other characters from the Percy Jackson universe popping up, such as Chiron, who might offer some advice or guidance regarding Percy's new training regime.
One main antagonist could be Nyx, the goddess of the night. Since Apollo represents the sun, Nyx might see Percy as a threat as he is the champion of Apollo. She could try to plunge the world into eternal darkness and send her monstrous children to stop Percy.
Another possible antagonist could be some of the more power - hungry and jealous demigods. They might not like that Percy has been adopted by Apollo and is getting special attention. They could try to sabotage his missions or spread rumors about him to turn the other demigods against him.
One of the well - known authors is 'SunnyWriter'. Their fanfics about Apollo and Percy are always full of adventure and great character development. Another good author is 'MythicalFictionFan'. They often write stories that explore the deeper relationship between Apollo and Percy.
One great fanfiction could be about Percy and Apollo going on a quest together. Maybe they have to retrieve a lost musical instrument of Apollo that has the power to control the tides. In this fanfic, Percy's water powers and Apollo's sun - related abilities would make for an interesting combination.
Obviously, Atlas is a main character. He's often portrayed in different ways, sometimes as a more sympathetic figure trying to break free from his past, or as a more menacing antagonist still holding onto his old grudges. Percy Jackson also often shows up. His interactions with Atlas can range from confrontational to reluctantly allying with him.
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.