In the fanfiction, Percy might face new challenges related to his demigod status. Maybe he has to deal with the aftermath of the war, like rebuilding Camp Half - Blood or helping new demigods adjust.
One possible plot could be Percy and his friends dealing with the aftermath of the war in the mortal world. Maybe they have to hide their demigod identities even more carefully as the war has drawn some unwanted attention. They could also be working on rebuilding Camp Half - Blood and trying to make it safer for new demigods.
Well, perhaps they start to plan for their future together. They could be thinking about things like where they want to live. Maybe they decide to build a house near Camp Half - Blood so they can still be close to their friends and the place that means so much to them. Also, they might start training the new demigods together, passing on their skills and knowledge.
Perhaps some of the demigods from other camps that he didn't interact much with before could become his new allies. They might see his leadership during the war and want to be part of his group, to learn from him and fight alongside him in any future conflicts.
In fanfiction, Percy might finally get some peace. He could go back to school and try to have a normal life, but still be on guard for any new threats. Maybe he'd focus more on his relationship with Annabeth and they'd plan for their future together.
It could be a rogue demigod who was on the losing side of the Giant War and is now seeking revenge. This demigod might have found some dark power or be allied with some minor but dangerous mythical creatures.
After the war in fanfiction, Percy's character could shift in a more introspective direction. He has witnessed so much death and destruction that he starts to question the nature of the gods and their role in the lives of demigods. This internal struggle makes him more complex and wise. Annabeth, on the other hand, might become more assertive. She has proven herself in battle and now feels more confident in her ideas and decisions. She uses this new - found confidence to advocate for better living conditions and training for demigods. Their characters' development is intertwined with the experiences they had during the war and the hopes they have for the future.
One possible reason could be that she sacrifices herself to save someone else. Maybe she jumps in front of a fatal blow meant for Percy or one of the other important demigods. Another reason could be that she makes a miscalculation in her battle strategy. She might underestimate the strength or the trickery of the giants and end up in a situation where she can't escape.
There could be new demigods. Maybe some who were hidden during the giant war and now come out. For example, a demigod of a less - known god or goddess.
Well, they would probably communicate better. In Tartarus, they had to rely on clear communication to survive. So, back in the normal world, this would carry over. They'd be more open about their feelings, fears, and plans, which would strengthen their relationship in a more emotional way.