At first, Percy might be a bit stunned. He's used to seeing Annabeth at Camp Half - Blood or in the midst of some dangerous adventure. Seeing her at his mortal school, Goode High, would be unexpected. But then he'd quickly recover and start chatting excitedly with her, asking how she got there and what she's been up to.
Percy's reaction could be a mix of emotions. He would be thrilled to see Annabeth, of course, but he might also be a bit worried. He has to balance his mortal life at Goode High with his demigod world. He might be afraid that her visit could draw unwanted attention from monsters or disrupt his attempts to fit in at school. However, overall, his happiness at seeing her would likely outweigh any concerns.
Percy would be overjoyed. He's always happy to see Annabeth. He'd probably have a big grin on his face and give her a huge hug right away.
One possibility is that Percy is in the middle of a boring class at Goode High when Annabeth shows up. He might be so shocked and happy that he forgets all about the lesson. They could then sneak out to a quiet place in the schoolyard and catch up on all their adventures and how much they've missed each other.
One day, Percy was having a normal day at Goode High School. He was sitting in class, half - listening to the teacher, when suddenly Annabeth walked into the classroom. Everyone stared as she made her way straight to Percy. She had a big smile on her face. 'Surprise!' she said. Percy's face lit up immediately. He had no idea she was coming. They hugged right there in the middle of the classroom, much to the amusement of their classmates.
Well, perhaps Annabeth decides to surprise Percy at his high school by disguising herself as a new student. She enrolls in the school for a day and joins Percy's class. When Percy sees her sitting there, he can't believe his eyes. She then reveals her true identity during lunch break and they have a sweet reunion, sharing stories about their latest demigod adventures.
Some of Percy's classmates might be in awe of Annabeth. She's smart and confident, so they could be a bit intimidated at first. But then they start to admire her for her knowledge.
She's probably super excited. She might run and give him a big hug right away.
He could also become withdrawn and depressed. Percy and Annabeth have a very strong bond, and her death would leave a huge void in his life. He might isolate himself from his friends and family, lost in his grief and memories of her.
Annabeth could also be angry, not at Percy but at the situation or the forces that led to his death. She might vow revenge and start on a journey to find out who or what was responsible for Percy's sacrifice and make them pay. This could lead her into a whole new set of adventures and challenges as she tries to come to terms with her loss.
She might be heartbroken at first. She could try to jog Percy's memory by showing him things that were important to them.
Well, in many such fanfictions, Percy might be extremely flustered. He could blush furiously and quickly look away, being the gentleman that he is. After all, he has deep respect for Annabeth.
He could also become angry. Percy has a bit of a temper, and he might lash out at Annabeth, demanding an explanation. He might feel betrayed, especially if he doesn't understand the real reasons behind the break - up. In his anger, he could distance himself from their mutual friends and go on solo quests to clear his head.