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.
Obviously, Percy Jackson is the main character. He is the one who becomes the soldier of chaos. His character development from a hero of the Olympians to a figure in the chaos realm would be a central focus.
Once upon a time, I found myself in the world of Percy Jackson. I was a soldier, trained in modern combat, but now thrust into a world of gods and monsters. I joined Percy's group, using my combat skills to fight off the occasional hellhound. I quickly learned about the power of the gods and how to use the environment to my advantage, like using water jets against fire - breathing creatures.
One common theme is sacrifice. As a soldier, Percy often has to make tough choices that involve sacrificing his own well - being for the greater good. Another theme is loyalty. He remains loyal to his friends and the gods even in the most difficult of situations.
In this type of fanfiction, it's a really interesting concept. One possible scenario could be that Percy's death is a heroic sacrifice. Maybe he gives his life to save the world from an even greater threat than before. And when he becomes a god, he might use his new powers to bring about a new era of peace among the gods and demigods. His transformation could also mean changes in his relationships. For example, his friends might now have to view him in a different light, as a divine being rather than just a fellow demigod.
If Percy becomes a vampire, his relationships would change drastically. His friends from Camp Half - Blood might be afraid of him or try to find a way to 'cure' him. His relationship with Annabeth would be put to the test. She might be determined to save him, but also conflicted because of what he has become. And Percy himself would have to deal with the fact that he now belongs to a different 'species' so to speak.
If Percy Jackson were to become a hidden god in fanfiction, it would likely involve a lot of mystery and suspense. He'd have to navigate a world where he couldn't reveal his true nature easily and could potentially uncover some dark secrets along the way.
His friends from Camp Half - Blood like Annabeth could be his allies. Annabeth is smart and strategic, and she would be able to offer valuable advice as Percy goes through the process of becoming a minor god.
Another plotline could involve Percy's relationships with other characters. Maybe he has to face some of his old friends who now see him as a threat because of his association with chaos. Or perhaps he forms new alliances with characters who are also on the side of chaos, but they have different motives.
One great Percy Jackson and Winter Soldier fanfic is 'The Olympian and the Super Soldier'. It has an interesting plot where Percy somehow gets thrown into the Marvel universe and teams up with Bucky Barnes, the Winter Soldier. The story does a great job of mixing the two universes' mythologies and powers.