Well, perhaps Percy could start off as a normal person who is suddenly intrigued by the world of monsters. Maybe he gets cursed and starts to transform into a monster himself bit by bit, and has to figure out how to reverse it while also dealing with his newfound monster - like instincts.
There could be a wise old monster who acts as Percy's mentor. Maybe a female monster who becomes Percy's love interest. And of course, there would likely be some villainous monsters who oppose Percy's new existence and try to harm him.
One change would be his interests. Instead of just focusing on Greek mythology and his demigod adventures, he now has an additional passion for dragons. He might start spending his free time reading dragon lore.
One idea could be that Percy uses his unique experiences in battles to teach combat strategy in a school for demigods. He could share real - life examples of how he overcame monsters and use those to illustrate key points in strategy.
Well, if Percy Jackson were to become an Avenger in fanfiction, there would be some interesting dynamics. For one, his loyalty to his demigod friends might conflict with the Avengers' way of doing things at times. But his ability to think on his feet, which he developed from all his quests, would help him adapt quickly. And his relationship with the other Avengers, like maybe a friendly rivalry with Thor over who has better control over elemental powers, could be a great plot point.
His old friends from Camp Half - Blood like Annabeth could be his allies. She would support him through the transition of becoming a god. Grover too, as his long - time friend, would be there for him. Also, some of the minor gods who have always been on good terms with Percy, like Hestia, might offer their help and guidance as he steps into his new role as a god.
I think the nature spirits might support Percy. Since Percy has a connection with water and nature in general, they would see him as a more benevolent leader compared to the current gods. Also, the mortals who have been saved by Percy in the past would probably be in favor of him becoming the king of gods. They believe he would use his power to protect them and make their lives better, rather than just for the gods' own amusement or self - interest.
One great 'Percy Jackson Monster Fanfiction' is 'The Monster's Perspective'. It offers a unique take on how the monsters in the Percy Jackson world view the demigods. It's really interesting to see their side of the story.
In this 'percy becomes a primordial fanfiction', the plot could involve Percy being thrust into a world where the rules of the original story no longer apply. As a primordial, he could have the ability to shape reality. He may start to question his own identity and purpose, and there could be a battle for control over his new powers between different factions.
Percy himself, of course. His friends like Annabeth and Grover would likely be in it too. Maybe there would be some new characters, like a powerful wizard who helps Percy on his path to fame. Or a mysterious stranger who initially opposes Percy but later becomes his ally.