One idea could be that they discover a long - lost family heirloom together. They go on a quest to figure out its significance and along the way, they face various monsters and challenges. It could strengthen their bond as siblings.
Another plot could be that Percy and Thalia find out they have a secret power that only activates when they are together. They then have to learn how to control this power while also dealing with the fact that some people might want to use them for their own gain because of this special ability.
A plot could revolve around them having to protect a young demigod who is being hunted by a powerful enemy. Percy and Thalia have different approaches to protection, and they might argue at first. But as they face more danger, they realize that they need to work together. Their sibling relationship would grow stronger as they defend the young demigod.
Another plot could be set in a modern - day high school where they are trying to keep their demigod identities a secret while also dealing with typical high school problems like bullies and exams. Their different personalities - Percy's laid - back heroism, Thalia's tough - girl exterior, and Nico's brooding nature - create interesting dynamics as they navigate both the mortal and demigod worlds together.
One plot idea could be them going on a quest together to find a long - lost artifact that has the power to unite the demigod camps. Another could be a story where they discover they have a hidden sibling bond that gives them unique powers when they work together. Maybe a plot where they have to face an ancient enemy that is specifically targeting their family line.
Perhaps a fanfiction where Percy and Thalia are transported to an alternate dimension. In this new world, they have to figure out how to get back while also dealing with different versions of their friends and enemies. Thalia might have to face an alternate version of herself who has turned evil, and Percy could be the one to help her see the light again. It would be full of action, drama, and self - discovery.
Maybe they are all transported to an alternate dimension where the rules of their world are different. Percy has to figure out how to use his powers without water, Thalia discovers new aspects of her lightning, and Nico has to deal with different types of underworld creatures. They must find a way to get back home while also helping the people in this new dimension.
One idea could be Percy and Thalia teaming up to protect a group of young demigods who are being hunted by a new and powerful monster. They could use their combined skills, Percy's water powers and Thalia's electric ones, to fend off the attacks.
One idea could be that Thalia and Percy are on a dangerous quest together. In the middle of it, they find a mysterious lemon - themed garden that has magical properties. The lemon trees might have fruits that can heal wounds or give them special powers. They have to protect this garden from monsters while also exploring their feelings for each other.
One idea could be that they discover their twin bond gives them unique powers. For example, they can combine their skills in combat, like Percy's water control and Thalia's lightning, to defeat a powerful enemy. Another plot could involve them exploring their family history together, finding out secrets about their parents that change their view of themselves. Maybe they meet a relative who knew about their twin relationship all along but was sworn to secrecy.
Popularity of Percy, Nico and Thalia siblings fanfiction varies. There are those who adore the idea of reimagining their relationships in this way. It gives writers a chance to delve deeper into their backstories and how they would support or conflict with each other as siblings. For example, Percy's leadership and Nico's more brooding nature, along with Thalia's fierceness could create really interesting family - oriented story arcs. Plus, fans who love the characters are always eager to see new angles on them, which makes this type of fanfiction appealing to a segment of the fanbase.
One idea could be Percy and Thalia teaming up against a powerful new enemy that neither could face alone. Their combined powers and sibling bond make them a formidable force.