In the fanfiction, they could be given important missions. Maybe they are tasked with restoring balance in a part of the Chaos realm that has been thrown into disorder. Percy's leadership skills, Thalia's combat experience, and Nico's knowledge of the underworld could all be put to good use. They would have to work together, which might not be easy at first given their different personalities. But as they face challenges, they would grow closer and become a more effective team.
They could be sent on epic quests by Chaos. Maybe they have to retrieve some powerful artifacts that were lost in the chaos of creation. Along the way, they would face numerous challenges and meet all kinds of strange creatures. Percy would use his strategic thinking, Nico his knowledge of the underworld, and Thalia her leadership skills to overcome obstacles and make their way towards their goal.
The Titans could still be their enemies. Even in the realm of Chaos, the Titans might see them as a threat to their potential return to power. Kronos, if he somehow still has a presence, would likely oppose them. He would not want these three, especially Percy who has defeated him before, to gain more power from Chaos.
The story would develop with them exploring the Chaos realm. They might discover ancient secrets and long - lost powers. Their relationships with each other would evolve. For example, Thalia and Nico might bond over their shared experiences in the face of the new and terrifying things in the Chaos realm. Percy could act as the mediator between them at times. They would also have to deal with the politics and power struggles within the Chaos realm. There could be factions that want to use them for their own ends, and they would have to navigate through these tricky situations while still trying to achieve their own goals.
One possible plot could be that Percy and Thalia are tired of the constant battles and politics in their current world. Chaos offers them a new beginning. They join Chaos' forces and are trained in unique ways. Percy might use his water - controlling abilities in new and unexpected ways under Chaos' guidance. Thalia could also enhance her skills with lightning. Together, they go on missions to restore balance in different realms that are in chaos (in a non - traditional sense).
I really liked a fanfic where Nico discovers a hidden power related to Chaos and Percy and Thalia have to help him control it. The story delved deep into Nico's insecurities and how his friends supported him. It was really heartwarming and full of suspense at the same time.
Well, they might lose trust in their friends. For example, if they were betrayed by someone they considered a close ally in the demigod world, like a fellow camper at Camp Half - Blood. Percy could become more withdrawn, as he has always been a bit of a loner at heart. Thalia might turn bitter and angry, using her skills as a hunter more aggressively. Nico, being the son of Hades, could potentially be pushed towards using his darker powers in retaliation, perhaps even seeking vengeance in the Underworld's way.
In a fanfiction where they go to high school, Percy would likely be popular for his heroic deeds and good looks. He might join the swim team and break all the records. Thalia could be the cool girl who rides a motorcycle to school and gets into trouble for parking it in the wrong place. Nico would be the mysterious new kid. There could be a plot where they have to team up to stop a monster that is lurking in the school basement.
In this fanfiction, it could be that Percy, Nico and Jason are chosen by Chaos for a special mission. Chaos might have seen something unique in them, like Percy's leadership skills, Nico's connection to the underworld and Jason's strategic mind. They join Chaos and are part of a team that has to go on a quest to find some lost artifacts that are crucial in maintaining the balance between order and chaos in the universe. Along the way, they face many challenges, make new friends and enemies, and grow as characters.
In fanfiction, they might have an epic adventure. Percy could use his water powers to protect them if they encounter any danger. Thalia with her lightning might strike down foes. Nico could summon the dead to get information. Rhea might offer them some ancient wisdom or a special quest to save the world.
It could be the agents of Order who see Percy and Thalia joining Chaos as a threat to the balance they strive to maintain. They might send their best warriors to stop Percy and Thalia from carrying out Chaos' plans.