In the fanfic, it could be that Percy and Thalia have a certain level of trust and understanding that Jason lacks with either of them. For example, they might communicate in a way that Jason wishes he could with them. Percy's relationship with the gods, especially Poseidon, and Thalia's connection to Zeus might make them a more formidable and enviable pair in Jason's eyes. He may be jealous of the power dynamics and the way they interact within the story.
The jealousy can create conflict. Jason might start to act out, causing rifts between himself and Percy or Thalia. This can lead to different story arcs, like a rivalry developing. For instance, he could try to undermine Percy's actions or try to get closer to Thalia in a way that seems forced, which drives the plot forward as other characters react to his behavior.
In such a fanfiction, Jason might be jealous because Percy has a strong connection with the sea and Thalia is a powerful daughter of Zeus. Maybe Jason feels overshadowed. For example, Percy's feats in the ocean make him stand out, and Thalia's leadership skills are remarkable. Jason could be jealous of the attention they get.
The jealousy could lead to a split in the group. If Jason is constantly jealous, he may distance himself from Percy and Thalia, which would change the group dynamics. This could then lead to new alliances and rivalries within the fanfiction. Maybe Jason teams up with other characters who also feel left out because of Percy and Thalia's popularity.
In the fanfiction, it could be that Percy and Thalia have a long - established friendship. Jason, being new to their group or dynamic, might feel like he can't break into that bond. He may see how they rely on each other and communicate without words, and he wishes he could be part of that. The jealousy then stems from his desire to be as close to them as they are to each other.
It can add a lot of drama to the story. For example, Jason's jealousy might lead to him making rash decisions. He could try to compete with Percy and Thalia in a way that causes problems for their group. This might create conflicts that they have to resolve, making the story more interesting.
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.
At first, it might show the tension between them due to Jason's jealousy. Jason could be distant or snippy with Percy. But as the story progresses, they might start to communicate. Maybe Percy notices Jason's jealousy and tries to reach out, which begins to thaw the ice between them.
Jason's jealousy might initially make him act out in negative ways. He could be bitter towards Percy and Thalia, which would isolate him from them and others. But as the story progresses, he might realize that his jealousy is unfounded and start to change for the better, learning to be more confident in himself.
One reason could be Percy's popularity. Percy has many friends and is well - liked in the demigod community. Jason might feel overshadowed by Percy's charisma and the attention he gets.