Another plot could involve Zoe finding out that Percy's death was part of a larger, more sinister plan. She then sets out to expose those behind it and avenge Percy. Along the way, she discovers hidden secrets about Percy that she never knew before, like his family history or some special powers he was about to unlock. This knowledge gives her more motivation to see her mission through to the end.
Maybe in the fanfic, Percy's death could be a sacrifice to save Zoe. This would then lead Zoe to live her life in a way that honors Percy's sacrifice. She could become a protector of the things Percy held dear, like a certain place or group of people. And as she does this, she has flashbacks of their time together, which are bittersweet memories that keep her going.
The other demigods at Camp Half - Blood would also be in chaos. Percy was like a leader to many of them. His death could lead to a lack of confidence among the younger demigods. Some might even start to question the protection of the gods. Zoe's survival could also lead to her taking on a more prominent role in guiding and protecting the demigods, which is a big change from her previous situation.
Zoe could become more withdrawn initially. Losing Percy, who was perhaps a close friend or love interest, would be a huge blow. But then, she might slowly turn her grief into strength. For example, she could become more determined in her fights, using Percy's memory as a source of inspiration.
One possible plot could be Percy sacrificing himself to save his friends while in Poseidon's arms. Maybe there's a great battle against an unbeatable foe, and Percy realizes the only way to victory is through his own death. He accepts his fate in Poseidon's comforting embrace.
One common theme is adventure. Since both Percy and Zoe are often involved in action - packed situations, fanfics usually center around them going on quests or facing dangerous foes together. Another theme is the development of their relationship, from initial distrust to a deeper bond.
In a 'Percy Jackson Dies' fanfic, one possible scenario could be that he sacrifices himself to save his friends during an epic battle against a powerful new enemy. Maybe a horde of monsters that are immune to his usual powers overwhelm him while he's trying to buy time for his friends to escape.
One possible story could be that Percy is a powerful wizard in a magical fanfic world, and Zoe is his daughter who discovers she has inherited his magical abilities but struggles to control them. Percy then has to train her while also protecting her from those who might want to use her powers for evil.
One possible plot could be that the murderer is a jealous rival. Maybe this rival has always been envious of Percy's popularity or special abilities, and finally decides to get rid of him. Another plot could involve a mystery where Percy is murdered and his friends have to piece together the clues to find out who did it. It could be that the real killer is someone they least expected, like a seemingly friendly acquaintance who has a hidden agenda.
The characters would be devastated. Grover, Percy's best friend, would be heartbroken. He might lose his ability to find Pan because of the emotional turmoil. His search for Pan was always connected to his friendship with Percy, and without Percy, he could be lost.
Their interaction could be very emotional. Percy might be in shock at first to see Zoe again. He could be filled with guilt for not being able to save her when she was alive.
One plot could be that there's a mystery in Camp Half - Blood that only Percy, Zoe, and Lemon can solve. It might involve a series of strange disappearances that seem to be related to an ancient curse. They would have to follow clues, which could lead them to different parts of the demigod world, from the Underworld to the lairs of various mythological creatures.