Perhaps Percy wakes up one day in a world where the concept of demigods doesn't exist. He has to adapt to this new reality while also carrying the memories of his supposed demigod life. He could struggle with whether to try and bring back the idea of demigods or just accept this new world. Along the way, he meets new friends who have different beliefs and values, and he has to decide if he wants to fit in with them or hold on to his old self.
Another idea is that Percy is actually an ordinary human who has been mis - identified as a demigod. He then has to deal with the expectations of those around him who think he has special powers. He might try to prove that he's not a demigod while also getting caught up in the demigod - related events due to his associations. This could lead to some comical and also tense situations as he tries to convince everyone he's just an average guy.
The plot could involve Percy being ostracized by the other demigods due to his relation to Kronos. However, he discovers a prophecy that only he, as the son of Kronos, can fulfill. This prophecy might be about saving the world from a new threat that is related to the Titans in some way. He then has to go on a quest to gather ancient artifacts or gain the trust of certain beings to be able to carry out the prophecy.
One idea could be that the forgotten demigod discovers a hidden power within themselves that is related to an ancient and forgotten god. This power could set them on a journey to find out more about their heritage and also put them in a position to save the demigod world from a new threat.
Perhaps Percy discovers a hidden prophecy that involves him sacrificing something dear to him to save the demigod world once and for all. This could lead to a lot of internal struggle as he decides what to do. In the fanfiction, he could journey to places never before explored in the original series to find answers.
Perhaps a story where Percy gets transported to a different era in the demigod world. He could be in the time when the first demigods were discovered and has to deal with the primitive and different rules and threats of that time. He might also learn some long - forgotten secrets about his own powers.
The significance is that it sets Percy Jackson apart. It tells us that the Percy Jackson series is not some secondary, unoriginal work. It has its own story to tell that is not based on the typical fanfiction ideas of demigods. It's a way of emphasizing the originality of the Percy Jackson concept.
Yes, there are many. You can find them on various fanfiction websites. Some might explore Percy Jackson in an imperial or demigod - like role in new and exciting adventures that the original series didn't cover.
Another idea is to explore the relationship between the Norse gods and the Greek demigods in a fanfiction. Maybe the Norse gods are intrigued by Percy's powers and want to test him, or perhaps they offer him a quest in the Norse world. This could lead to Percy having to adapt to the different rules and challenges in the Norse realm.
One interesting story could be about a Japanese demigod who has a special power related to Japanese mythology, like the ability to control kami. They might team up with Percy Jackson on a quest that involves both Greek and Japanese mythological elements.
Maybe in the fanfiction, the zoo is a place where the gods have hidden some of their lost magical artifacts. Percy, being the son of Poseidon, senses a strange water - based magic near the aquarium section. He starts to investigate with Annabeth. Along the way, they face challenges from zoo security (who are unknowingly being influenced by a minor god who doesn't want the artifacts found) and various magical traps set around the exhibits.
A plot could involve Percy being sent to Forks on a quest. He discovers that there's a powerful artifact hidden in the area that could cause chaos if it falls into the wrong hands. The vampires and werewolves in Forks are also after this artifact for their own reasons. Percy has to navigate the complex relationships between these two groups while also trying to keep his true identity as a demigod a secret. Along the way, he forms an unlikely friendship with Jacob, who helps him understand the ways of the werewolves.