She becomes very focused and single - minded. In a fanfic where Percy is poisoned, Annabeth quickly starts to research all possible antidotes. She interrogates other characters who might know something, and she doesn't rest until she has a lead. She also gets very emotional in private. She might cry when she thinks no one is looking because she's so afraid of losing Percy. But in front of others, she's strong and in control, leading the search for a solution to save him.
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.
He could also become withdrawn and depressed.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.
A really interesting fanfic has Percy being struck by a cursed weapon in a fight. The curse starts to consume him from within. Annabeth is desperate. She travels to different realms in search of a way to break the curse. Along the journey, she discovers hidden powers within herself. Meanwhile, Percy is in and out of consciousness, and their bond is put to the ultimate test as she tries everything she can to save him.
On the other hand, she could try to honor Percy's sacrifice. Annabeth might focus on the reasons why Percy died for her and strive to fulfill any tasks or goals that he might have hoped she would achieve. She would carry on his legacy in a positive way, even though she is heartbroken.
Percy would be completely devastated. He might go into a state of shock at first, unable to believe that Annabeth is really gone. Then he could become filled with rage, vowing to take revenge on whoever or whatever was responsible for her death.
In Percabeth fanfiction, Percy needs Annabeth in terms of her wisdom. She can solve puzzles and figure out mysteries that Percy would struggle with on his own. Also, she's his connection to the Athena cabin. This connection gives Percy access to resources and allies that he might not have otherwise. Moreover, Annabeth is his confidante. He can share his deepest fears and secrets with her, which is essential for his mental well - being in the often - stressful scenarios in fanfiction.
In fanfiction, Percy needs Annabeth because she's his strategic partner. Annabeth's intelligence complements Percy's more impulsive nature. For example, in many adventure - based fanfics, she can plan their moves while Percy executes them. Their relationship is like a well - oiled machine, and without her, Percy would be lost in complex situations.
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.
She might be heartbroken at first. She could try to jog Percy's memory by showing him things that were important 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.