There could be a curse placed on Percy by an ancient enemy of Poseidon. This enemy, still holding a grudge from long ago, manages to find a way to cast a shrinking curse on Percy. It could also be a side - effect of some powerful magic that was unleashed during a fight against a new, unknown enemy. Percy just happened to be in the wrong place at the wrong time and got shrunk as a result.
It could be a new, mischievous minor god or goddess. Maybe a god of miniatures who is jealous of Percy's fame and decides to shrink him as a prank. Another possibility is a rogue magician or sorcerer who has a vendetta against demigods and specifically targets Percy to make him less of a threat.
Well, it might be an experiment by one of the Hephaestus kids gone wrong. They were working on some new magic - infused technology and accidentally created a device that shrunk Percy. Or perhaps a new type of magical creature that has the power to shrink things and it sees Percy as a threat to its territory or its way of life, so it uses its shrinking ability on him.
One plot idea could be that Percy, shrunk to a tiny size, has to navigate the Camp Half - Blood cabins without being noticed. He might discover hidden secrets in the nooks and crannies that are normally overlooked. Another could be that he gets stuck in a magical object, like a tiny charm on Annabeth's bracelet, and has to find a way to communicate his situation to his friends. Maybe he's shrunk by a new enemy who wants to keep him out of the way during an important prophecy - related event.
A vengeful god could be the cause. For example, if Percy somehow angered Ares, Ares could manipulate the situation so that Percy gets arrested by mortals. He might use his influence to make it seem like Percy was involved in some sort of illegal fighting or destruction.
It could be Chaos, as Chaos is often considered the primordial state from which all else emerged in Greek mythology - inspired Percy Jackson lore. So in fanfiction, it would make sense for Chaos to be the first being.
Well, sometimes in fanfiction, his brother might be a mortal who discovers his demigod heritage later. This could add an interesting twist to the story as he has to adapt to the world of gods and monsters. Or it could be a long - lost half - brother from a different camp, like a son of Poseidon from another part of the world who was hidden away for some reason.
It could be Annabeth. Maybe they had a huge fight over something important, like the future of their relationship or a difference in their values regarding their demigod duties. And this fight led to Annabeth leaving Percy, which broke his heart.
He might meet some native Alaskan spirits. These spirits could be like the nature spirits he has encountered before but with their own unique Alaskan characteristics.
Well, in the 'Percy Jackson hunted by Shield' fanfiction, Percy's main source of help would be his demigod comrades. Annabeth Chase, with her brilliant mind and knowledge of architecture and strategy, could help Percy plan his escapes and defenses. Grover Underwood, being a satyr, has a connection with nature that could be used to create barriers or mislead Shield's agents. Additionally, Chiron, the centaur trainer at Camp Half - Blood, might have some ancient knowledge or magic that could be used to protect Percy or make him less detectable to Shield. There could also be other demigods with unique powers that could come to Percy's aid, for example, those with the power of invisibility or mind - control who could use their abilities to disrupt Shield's operations.
He could meet some Aboriginal heroes or spirits. They might have their own powers and knowledge that Percy can learn from.
Percy might encounter Baba Yaga. She is a well - known figure in Russian folklore. She could be an adversary, testing Percy's skills and his knowledge of the magical world. Or perhaps she could be a source of information if Percy manages to earn her respect. He could also meet the Rusalki, water nymphs from Russian mythology. Given Percy's connection to water, it would be interesting to see how he interacts with them.
Well, in a lot of Percy Jackson fanfiction, the primordial deities can be seen as the strongest beings. For example, Chaos, who is the very beginning of everything. It has the potential to create and destroy on an unimaginable scale. Since it is the origin of all existence in the Percy Jackson universe, it stands to reason that it would be extremely powerful. And there are also other primordial deities like Nyx, the goddess of the night, who has powers that are both mysterious and very potent. She can bring darkness and nightmares, and her powers are not to be underestimated in the fanfiction world.