Well, it could be because they both care deeply about Nico in different ways. Maybe Jason sees Nico as a great friend and ally, and Percy feels the same but in a more possessive way. In fanfiction, authors often play with these complex relationships to create drama.
One reason could be that in the fanfiction world, their different personalities clash when it comes to Nico. Percy is impulsive and passionate, while Jason is more level - headed. When it comes to Nico, their different approaches to friendship and loyalty might cause a rift and lead to a fight. For example, Percy might rush into a situation to save Nico without thinking, while Jason would plan it out, and they could argue over whose method is better.
One possible reason could be jealousy among other characters. Maybe there are those who envy Percy's powers and leadership, Jason's status as a hero, or Nico's unique abilities. Another reason might be a misunderstanding. For example, they could be wrongly accused of a crime they didn't commit, which leads to others turning against them.
In the fanfiction, it could be that Jason has been through a lot with Percy. They might have shared many adventures and experiences that made Jason feel like he has a sort of claim over Percy. It could also be related to the world - building in the fanfiction. For example, if there are certain power dynamics or alliances that make Jason protective and possessive of Percy. Another aspect could be that the author wants to explore a complex relationship dynamic between the two characters, where Jason's possessiveness adds an interesting layer to the story.
Well, it could be that in the fanfiction, Percy and Thalia are both really popular and well - liked among their peers. Jason, on the other hand, might feel overshadowed by them. He's jealous because they seem to get all the attention and admiration, while he feels like he has to struggle more to be noticed.
Well, they could be betrayed by someone they trusted deeply, like a fellow demigod. Maybe this person spreads false rumors about them, leading to their isolation within the demigod community. The three of them would then have to struggle to clear their names and find out who really set them up.
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.
One of the common themes in fanfictions involving Percy, Nico, Jason and Chaos could be their epic adventures. For example, they might team up to face a new and powerful threat that emerges from the chaos itself. Maybe they have to journey through different realms, using their unique powers and personalities to overcome obstacles.
One possible reason could be a misunderstanding. Maybe Percy made a decision without consulting Annabeth, thinking it was for the best, but she felt left out. For example, if he agreed to a dangerous mission without her input. Another reason might be jealousy. If Percy got a lot of attention from someone else, Annabeth could feel insecure.
One possible plot could be that they discover they are brothers through a series of magical events. For example, a powerful oracle reveals the truth. Then they have to deal with the shock of this new relationship while also facing their common enemies. They might train together to combine their unique powers and protect their world from threats.
How about 'The Three Heroes'? This name showcases that there are three important members in the band, all of whom can be considered heroes in their own right. They have all had their own heroic adventures in the fanfiction, so it would be a great name to represent them as a band.
One possible plot could be that they have to team up to stop an ancient evil that is rising. Each of them brings their own unique powers to the table. Percy with his control over water, Jason with his power over the wind and lightning, and Nico with his ability to manipulate the shadows. They journey to different realms to find the artifacts needed to defeat this evil.