In this type of fanfiction, it's a really interesting concept. One possible scenario could be that Percy's death is a heroic sacrifice. Maybe he gives his life to save the world from an even greater threat than before. And when he becomes a god, he might use his new powers to bring about a new era of peace among the gods and demigods. His transformation could also mean changes in his relationships. For example, his friends might now have to view him in a different light, as a divine being rather than just a fellow demigod.
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.
Maybe he faced an extremely powerful enemy that he couldn't overcome. It could be a new and terrifying monster created by the Titans or some other dark force.
In fanfiction where Sally dies, it's a major turning point. Percy's character development could take a different route. Instead of having his mother as his anchor, he has to find strength within himself. This could make him more reckless at times as he no longer has that voice of reason in his life. It might also make the other characters step up more to support Percy, like Annabeth having to be more of a stabilizing force for him. And the story could then focus more on Percy's internal struggle with loss and how he copes with it in the world of demigods.
One thing that might occur is that Percy's death could be a catalyst for a major shift in the demigod world. Since he's such an important figure, his passing would be deeply felt. But as he becomes a god, he could bring about a new balance. For instance, he could end the long - standing rivalries between different groups of demigods. His newfound godly status would give him the power to enforce new rules and ensure fairness. Also, his relationship with Annabeth would take a very different turn. She would have to deal with the fact that her lover is now a god, which could be both a source of pride and a great challenge.
It could be a new, powerful Titan that was previously unknown. This Titan might have a vendetta against Percy specifically, seeing him as a major threat to their plans. Maybe they manage to kill Percy, but his rebirth sets in motion a series of events that will lead to their ultimate downfall.
One possible plot development could be that when Percy dies, his friends are devastated. They might embark on a quest to find a way to bring him back. In the process, they discover some long - hidden secrets about the gods. Another development could be that Percy's rebirth gives him new powers, which he then uses to fight a greater threat that was emerging even before his death.
One common plot twist is that Percy discovers his mother isn't really dead. Maybe she was taken by a powerful being and is being held captive in some hidden realm. Percy then embarks on a secret quest to rescue her, which could involve making deals with some very dangerous entities.
One possible storyline could be that in a battle against a new and powerful enemy, Annabeth sacrifices herself to save Percy. Maybe she steps in front of a deadly attack meant for him, like a powerful magic blast from a primordial being. This would shatter Percy, leading him on a journey of both revenge and self - discovery as he tries to come to terms with her loss.
The other characters would likely be devastated. Annabeth, his love, would be heartbroken. She might become more withdrawn and determined to avenge him. His friends like Grover would be in deep sorrow, feeling as if they've lost a part of their strength. And the whole demigod community could lose hope, as Percy was seen as a great hero.