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.
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.
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.
Yes, in some fanfiction, Percy Jackson can be depicted as a Frost Giant. Fanfiction allows for a lot of creative interpretations, and authors might take the existing Percy Jackson universe and twist it in unexpected ways, like making him a Frost Giant.
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.
In the 'Percy Jackson After the War Fanfiction', a plotline could be about the demigods integrating with the mortal world more. Percy, being a half - blood, has always had one foot in each world. Now, after the war, he might be more determined to make the two worlds coexist peacefully. He could start initiatives at Camp Half - Blood to teach demigods about mortal culture and vice versa. Another aspect could be the power dynamics within the demigod community. With some of the major villains defeated in the war, new leaders could emerge. Percy might not be interested in being a leader but could be thrust into that role. And finally, there could be a story about how the demigods deal with the memories of those who died in the war. They could create memorials or have special ceremonies to honor the fallen.
Percy Jackson himself is almost certain to be a main character. After all, the fanfiction is centered around him after the war. Annabeth Chase would also likely be a main character, as she is Percy's love interest and a powerful demigod in her own right. Grover, Percy's best friend, would probably be there too, still looking out for nature and helping Percy in his new adventures.
One possible plotline could be Percy dealing with the aftermath of the war in his personal life. Maybe he struggles to adjust back to a normal routine, like going to school. Another could be his relationships with other demigods changing. For example, some might see him as a hero and put him on a pedestal, while others could be jealous of his new - found fame. There could also be new threats emerging in the post - war world that only Percy and his friends can handle.