The fanfic could center around a mystery. There's a strange phenomenon happening in their world and they are the ones chosen to solve it. As they investigate, they start to uncover secrets about their pasts and their families. This could add an emotional depth to the story as they deal with these revelations while also trying to solve the mystery.
A simple plot could be a race against time. They have to reach a certain place before an evil force does. Thalia could use her speed and strength, Percy could use his strategic thinking as a champion, and Zoe could use her knowledge of the terrain to lead them. They might encounter traps and minions of the evil force along the way.
It might also be a story about their relationships. Perhaps there are tensions between them at first. Percy's status as a champion might make Thalia a bit jealous or Zoe might be skeptical of his abilities. But as the story progresses, they learn to trust and rely on each other, forging a strong friendship.
Maybe Percy has to fight against powerful primordial forces that threaten the world he knows.
Perhaps the fanfic focuses on Percy's relationship with the god he is a champion for. There could be internal conflicts as he tries to balance his own values with the demands of the god. He might also have to interact with other demigods who are either jealous or in awe of his new status.
The plot could be centered around a prophecy that involves both Percy and Zoe. They are forced to team up despite their initial differences. For example, Percy is more impulsive and Zoe is more reserved. As they journey to fulfill the prophecy, they encounter mythical creatures and ancient magic that test their limits.
Well, it could involve Percy going on a quest specifically for Hades. Maybe he has to retrieve something from the Underworld that only he can do as the so - called 'Champion of Hades'.
One possible plot for a 'Percy Jackson Champion of Nyx fanfic' would be that Nyx chooses Percy as her champion to stop an ancient evil that is rising. Percy would have to train in the ways of Nyx, which are very different from what he's used to. He'd have to learn to harness the power of the night, deal with Nyx's shadowy minions, and find a way to unite the demigods who are skeptical of his alliance with Nyx. As he delves deeper into this role, he uncovers secrets about Nyx's past and how it ties to the future of the demigod world.
Redemption is another theme that pops up. Maybe Zoe has made some mistakes in the past, and fanfics could explore her path to redemption. Or perhaps Percy has to atone for something, and how Thalia and Zoe play a part in that. There's also the theme of family, not in the traditional sense always, but like a found family. Since they are comrades in their adventures, they can form a strong family - like bond, and fanfics often explore the dynamics of such a relationship.
Well, it could involve Percy going on a quest in Mars' domain. Maybe he has to retrieve some powerful weapon that was lost there. It could also include him facing off against Mars' enemies or creatures specific to that realm.
It could involve Percy having to face challenges related to the sun and moon deities. Maybe he has to retrieve a powerful artifact that controls the sun and moon's powers.
Zoe could become more withdrawn initially. Losing Percy, who was perhaps a close friend or love interest, would be a huge blow. But then, she might slowly turn her grief into strength. For example, she could become more determined in her fights, using Percy's memory as a source of inspiration.