Percy would likely approach Harry with a sense of excitement. He'd be excited to learn about a whole new kind of magic and would probably joke around a bit, like asking if Harry can turn water into butterbeer. Annabeth would approach it more analytically. She'd be interested in the structure of the wizarding world, the laws, and how it all functions. When it comes to Harry himself, they'd both respect his status as a hero in his own world. Percy might see him as a kind of kindred spirit, another young person thrust into dangerous situations. Annabeth would see the strategic mind behind Harry's actions and might even try to learn from him.
At first, Percy might be a bit over - eager. He'd want to show off his own powers, like making a small fountain of water appear in the middle of Hogwarts or something. Annabeth would be more reserved. She'd be thinking about the implications of this meeting for their own world. As for their reactions to Harry specifically, they'd be impressed by his courage, which they can relate to from their own battles. Percy would probably want to be friends right away, while Annabeth would take a bit more time to warm up.
Percy would probably be curious. He's always up for new adventures and meeting new people. He might immediately ask Harry about his magic and how it works. Annabeth would be more cautious. She'd be observing Harry, trying to figure out if he could be trusted. But once she realizes he's on the side of good, she'd start asking intelligent questions about the wizarding world, like how their education system compares to Camp Half - Blood's training.
Some of Annabeth's friends could react with laughter and jokes, while others might be a bit flustered and not know how to act. It really depends on the personalities of the friends in the fanfiction.
They might be shocked. Percy is not an ordinary guy, and his abilities would be quite a surprise to them.
She'd probably be shocked at first. But then her face would light up with joy. After all, she and Percy have been through so much together.
Percy might be a bit flustered and embarrassed. He's protective of his relationship with Annabeth, so having Magnus walk in might make him feel like their privacy has been invaded. He could quickly try to shield Annabeth or just look really shocked.
At first, Percy would likely be angry. He's a fighter, and being betrayed by someone he loves would fuel his rage. He might go after Annabeth to demand an explanation. But as the reality sinks in, he could become very sad and withdrawn. He might isolate himself from his other friends as well, feeling like he can't trust anyone anymore. He would constantly be thinking about what he did wrong to make Annabeth turn on him.
He would probably be shocked. Percy has always trusted Annabeth, so being stabbed by her would be completely unexpected. He might initially be unable to believe what's happening.
Annabeth would likely be furious at first. She has been through so much with Percy, and for him to leave her for Calypso would seem like a betrayal. But then, she might also start to reflect on their relationship and what went wrong. She could become determined to win Percy back or to move on and prove that she doesn't need him.
They would also be very protective. Tony Stark, for instance, would use his wealth and technology to give Harry a safe place to stay. Steve Rogers would offer his moral support and train Harry to be strong both physically and mentally. Natasha Romanoff would teach Harry self - defense skills. All of them would work together to make sure Harry never gets abused again.
Percy would feel a deep sense of guilt as well. He might think that he should have been there to protect her. So, he would be determined not only to free her but also to make sure whoever is responsible pays for what they've done. He would use his powers over water to his advantage, like creating distractions or using water to weaken the enemy's defenses while he tries to reach Annabeth.
He could be a bit shy. Since he also has feelings for Annabeth but was too nervous to make the first move. So when Annabeth asks him out, he blushes and stammers a bit, like, 'Uh, yeah, Annabeth. That sounds great.' And then he would be really happy inside, thinking about all the things they could do together on their date.