Percy might be devastated. He could feel a deep sense of loss as Jason was a comrade. He might blame himself for not being able to prevent it, even if it wasn't really his fault. Percy has a strong sense of loyalty and friendship, and Jason's death would shatter his world in the fanfiction.
In the fanfiction, Percy could initially be in shock. He'd have a hard time believing that Jason was gone. Then, as the reality sank in, he might become angry. Angry at the circumstances that led to Jason's death, whether it was an enemy or some unforeseen event. His reaction would also be tinged with sadness that would be hard to shake off. He might withdraw from others for a while, lost in his thoughts about Jason.
Well, it could vary greatly. Maybe he'd be amused. In many fanfictions, Percy has some wild adventures and Jason might find the creative interpretations of Percy's character quite funny. He could also be a bit jealous if the fanfiction portrays Percy in an overly heroic light compared to himself.
Percy might isolate himself. He'd find a quiet place, like by the sea, and just sit there, lost in his thoughts about Jason. The ocean, which is usually a source of comfort for him, might not be able to ease his pain this time.
After Percy's death, the story could focus on Jason's guilt. Since Percy died saving him, Jason might feel responsible and try to take on more dangerous quests to make up for it. Annabeth could go on a journey to find a way to bring Percy back, which could lead to new adventures and discoveries. The demigods might also face a new threat that they struggle to deal with without Percy's skills. They would have to learn to rely on each other in new ways and develop new strategies.
At the same time, Percy could be determined to find out why they betrayed him. He wouldn't just accept it passively. He'd be on a mission to uncover the truth, whether it was some outside influence or a misunderstanding that led to their actions. And he might also be a bit vengeful, thinking about getting back at them in some way, though his good nature might prevent him from going too far.
One reason could be Jason's popularity. Maybe Jason is getting more attention from their peers or the gods, which makes Percy jealous. Another might be related to a girl they both like. If the girl shows more interest in Jason, Percy could feel jealous.
In the fanfiction, the reason for Jason's jealousy could be a combination of things. Percy is often the center of attention when it comes to using powers. His powers are also associated with a very powerful element like water. Jason, on the other hand, may feel that his powers, although strong, are not as well - recognized. Also, Percy has a natural charisma when using his powers that Jason might envy. He may feel that Percy gets more praise and admiration from their peers just because of his powers, and this makes Jason jealous.
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, it might be that Percy has a more carefree attitude in some ways. He doesn't always follow the rules strictly and still manages to come out on top. Jason, who is more of a rule - follower and leader type, might envy Percy's ability to bend the rules and get away with it. Plus, Percy has a closer connection to Camp Half - Blood which has been his home for a long time, while Jason has to adjust to this new place and community, seeing Percy so well - integrated can make him jealous.
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.
Naruto is devastated. He feels a huge void in his heart. Jiraiya was the one who believed in him from the start, and his death makes Naruto question a lot of things. He might even start to doubt his own strength for a while.