Well, perhaps Percy has some personality traits that don't mesh with what Nico is attracted to. Maybe Percy is too outgoing and boisterous for Nico, who might prefer someone more reserved.
It might show their different social skills. Percy is great at making friends and leading, while Nico is more of a loner. So, this difference could be explored to show why Percy isn't Nico's type.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.
It's probably not a common type of fanfiction. There are many different types of fanfiction out there, from fluffy romance to epic adventures. Abuse is a very heavy and often uncomfortable topic. Only a small subset of fanfiction writers might be interested in exploring such a dark theme as abuse for the character Nico, so it's not likely to be widespread.
Yes, there are many. You can look for ones on platforms like FanFiction.net. Just search for 'Percy and Nico friendship' and you'll find a lot of great stories that focus on their bond as friends, like adventures they might go on together or how they support each other in the face of challenges.
Well, in many Percy and Nico friendship fanfictions, their bond is strengthened by their differences. Percy is more of a sunshine - like character, always optimistic and ready to jump into action. Nico, with his darker and more mysterious nature, provides a contrast. Sometimes, it's Nico who saves Percy from a dangerous situation that Percy's usual brashness got him into. This makes Percy see Nico in a new light, as a reliable friend. Their friendship also grows as they interact with other characters. When they are around their mutual friends, they learn more about each other's values and beliefs. And gradually, they become closer, sharing secrets and having each other's backs no matter what.
Well, their bond could be full of action. They might be constantly in danger, and their combined skills would be crucial for survival. Percy's ability to control water, Thalia's lightning powers, and Nico's control over the dead would make them a force to be reckoned with.
In some fanfictions, Percy's possessiveness of Nico is portrayed through his words. He could be very vocal about how Nico should stay close to him or how he doesn't like others being around Nico. Also, his body language might play a part, like always having a hand on Nico's shoulder or standing very close to him to mark his territory, so to speak.
In many fanfictions where Percy Jackson is Nico's brother, it creates a whole new dynamic in the story. It often leads to different interactions with other characters. For example, their relationship with Annabeth might change. Percy could be more protective of Nico, and Nico might feel more secure having Percy as a brother. It also gives room for exploring their family history in new ways, like how they deal with their demigod powers together and support each other in the face of various challenges in the demigod world.
One great fanfiction could be about their adventure in an unknown magical realm. They might have to combine their unique powers - Jason's control over the winds, Nico's ability to summon the dead, and Percy's power over water to defeat a powerful dark force.