A possible plot could involve the forgotten demigod being the key to unlocking a long - forgotten prophecy. However, no one believes in them at first. They have to prove their worth and fight against the disbelief of their peers and the forces that don't want the prophecy to be fulfilled. As they go through this journey, they form unexpected alliances and learn a great deal about themselves and the demigod world.
Perhaps the forgotten demigod gets lost in a parallel dimension where the rules of the demigod world are all mixed up. They have to figure out how to get back to their own world while also dealing with strange versions of their friends and enemies. They might even discover a way to bring some positive change from that dimension to their own.
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.
One idea could be exploring the backstory of the forgotten warrior more in - depth. Maybe they were once a great hero in a forgotten era of the Percy Jackson universe and got lost in time somehow. Another could be that the forgotten warrior has a special power that is now needed to defeat a new, emerging threat. They could be a key to unlocking an ancient prophecy that no one has understood until now.
One idea could be that the forgotten one has a special power that is the key to saving the world from a new, unknown threat. Another could be that they are actually a long - lost relative of Percy's and their connection reveals hidden secrets about the demigod world. Maybe the forgotten one was sent away on purpose by an enemy long ago and now they're back for revenge.
Maybe in the fanfiction, Percy stumbles upon a forgotten legend about a magical artifact that has the ability to rewrite the fates of demigods. The catch is that it's hidden in a realm that is slowly being consumed by chaos. Percy, along with his friends, must navigate this dangerous realm filled with strange creatures and illusions to find the artifact before it falls into the wrong hands. They'll also have to deal with the fact that the gods are not too keen on this artifact being found as it could disrupt their carefully crafted plans for the demigods.
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.
In 'percy jackson forgotten primordial fanfiction', there could be the idea of Percy having to deal with primordial forces that were previously unknown. This could lead to new alliances and challenges. Maybe he has to find a way to communicate with these forgotten entities, which would be a whole new aspect compared to his usual battles with known monsters and gods.
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.
One idea could be that the demigod gun is powered by celestial bronze. It could shoot bolts of energy that can temporarily stun monsters, like a more advanced version of a stun gun. This would give Percy an edge in battles against powerful foes.
One plot idea could be Percy having to team up with Hera to rescue a group of demigods who have been captured by an ancient monster. Hera, despite her usual aloofness, realizes she needs Percy's unique skills.