Another way Percy could react is by giving Annabeth the silent treatment. He wouldn't talk to her for a while, which would be really difficult for Annabeth as they are usually close. Percy would just go about his business, ignoring her attempts to communicate until he feels she has truly understood how much she has angered him.
Well, it could be that Annabeth constantly corrects Percy in front of others. For example, when Percy is making a plan to defeat a monster, Annabeth keeps interrupting and saying his plan is all wrong. This public humiliation might make Percy mad.
It could be because of a misunderstanding. In the fanfic, perhaps Annabeth was seen talking to an old acquaintance who Percy doesn't trust. He might jump to conclusions and get angry with her without really knowing the whole story. Like, if he thought she was plotting something behind his back with that person.
One possible reason could be a misunderstanding. Maybe Annabeth made a decision without consulting Percy, like choosing a quest that she knew was dangerous but didn't tell him until it was too late. Percy might feel left out and mad about it.
Well, in some fanfictions, Percy might be mad at Annabeth because of a misunderstanding. Maybe she made a decision without consulting him in a crucial situation regarding their adventures. For example, if she chose a path that put their friends in danger without his input, Percy could get angry.
It could strain their relationship a great deal. Their friendship and possible romantic relationship is based on trust. If Percy is mad, that trust is shaken. They might start avoiding each other, not sharing secrets like they used to.
A good 'Percy and Annabeth fanfic' should stay true to their characters. For example, Percy's loyalty and his sense of humor, and Annabeth's intelligence and determination. If the fanfic can capture these traits while putting them in new and exciting situations, like facing a new kind of monster or exploring a different part of the demigod world, it can be really great.
A good 'Annabeth Percy Fanfic' should have a strong understanding of their characters. For example, Percy's loyalty and his connection to the water, and Annabeth's intelligence and leadership. If the writer gets these aspects right, it can make the fanfic really enjoyable.
One common scenario is when Annabeth's over - intelligence leads her to overrule Percy's ideas in public. Percy, being a proud character, might get mad as he feels undermined. For instance, in a battle strategy discussion, if Annabeth dismisses Percy's plan without proper consideration just because she thinks her own is better.
When Annabeth is mad, Percy will likely try to make it up to her. He might start doing all kinds of things like bringing her favorite foods, trying to help her with her projects. But Annabeth might not be so easily swayed. She'll be looking for a real apology and for Percy to show that he's learned his lesson. So the relationship becomes a bit of a power struggle, with Percy trying to regain her favor and Annabeth deciding whether he's worthy of it.