The theme of friendship is very likely. They could start as acquaintances and grow into really good friends. Also, a theme of overcoming differences. Since they have different backgrounds and powers, they need to overcome those differences to work together.
One possible theme is loyalty. Percy and Nico could be loyal to each other through different trials. Another theme could be self - discovery. As they interact, they might learn more about themselves.
One possible reason is that their personalities clash. Percy is often portrayed as a more outgoing and confident character, while Nico is more introverted and brooding. In a fanfic, this could lead to misunderstandings and animosity between them. For instance, Percy's bold actions might seem reckless to Nico, causing him to dislike Percy.
One common theme is friendship. Given their different backgrounds and powers in the Percy Jackson universe, exploring how they become friends or strengthen their friendship is often seen. For example, in many fanfics, they start off not understanding each other but gradually learn to respect and rely on one another.
The theme of acceptance is quite common too. Nico has had to deal with a lot of things that make him different, and Percy's acceptance of him is often a central part of the story. Also, loyalty is a big theme. They show loyalty to each other in various situations, whether it's in the face of danger or when dealing with other characters who might not understand their bond.
One common theme is friendship. Since they come from different backgrounds within the demigod world, their journey to become friends is often explored. For example, in many fanfics, they start off not liking each other but gradually learn to respect and care for one another.
One possible theme could be friendship. Despite their different backgrounds and powers, they come together. Percy from Camp Half - Blood, Thalia as a daughter of Zeus, and Nico with his connection to the underworld. Their friendship could be tested and strengthened throughout the story.
They could fight due to a prophecy. If there's a prophecy that involves one of them being the 'chosen one' and the others think they should be, it would create a lot of tension. For instance, if the prophecy says that only one of them can save the world from a certain doom. Percy, being the main character in many stories, might be assumed by the others to be the one, but Thalia and Nico may believe they have just as much right. Their struggle for that role could lead to a fight. And during the fight, they would use their unique abilities. Percy would call upon the water, Thalia would summon her lightning bolts, and Nico would raise the dead to fight on his behalf.
One common theme is the exploration of their different backgrounds. Nico from the Underworld and Percy, a son of Poseidon, have such diverse origins. Fanfics often play with how these differences can create both conflict and connection between them.
One common theme is friendship. Given their different backgrounds and powers, stories often explore how they become friends and support each other. For example, they might start off as rivals but gradually learn to trust one another.
One common theme is self - discovery. Both Percy and Nico are often on a journey to understand their own feelings and sexualities within the context of the fanfic. For example, Nico might be struggling with his long - held feelings for Percy while Percy is realizing his own bisexuality or homosexuality.
In these fanfics, the theme of growth is quite prevalent. As they compete or face off against each other, they also grow as characters. They learn more about themselves and their capabilities. Additionally, the theme of loyalty to their respective sides or friends is often explored, especially when they are in conflict with each other.