It could be a new, powerful Titan that has emerged from the depths of Tartarus. This Titan might be jealous of the eldest primordial's power and wants to either destroy it or take its power for itself. And since Percy is associated with the eldest primordial, he becomes the Titan's target as well.
One idea could be exploring the backstory of the eldest primordial in more detail. Maybe how it came to be and its relationship with the other primordial beings. Another could be Percy having to team up with the eldest primordial to face a new, greater threat that neither could handle alone. For example, a powerful ancient evil that is awakening.
Yes, there are likely fanfictions with such a concept. The 'Percy Jackson' series has a huge fan base, and fans often come up with creative and out - of - the - box ideas. Some might explore the idea of Percy being born a primordial as it adds a whole new layer of depth and power to his character.
In the Percy Jackson universe, it could be Chaos. Chaos is often considered one of the most ancient and powerful entities. If Chaos were the eldest god in the fanfiction, it would bring a whole new level of power and mystery. Percy would be dealing with a being that is essentially the origin of everything, and its motives would be very difficult to understand.
One possibility for a Percy Jackson fanfiction centered around the Primordial Son of Chaos could be a story where Percy discovers a hidden prophecy related to this powerful being. Maybe he has to team up with some unlikely allies, like a group of minor gods who are also interested in the balance that the Primordial Son of Chaos might disrupt or uphold. This could lead to a series of adventures across different realms, including Tartarus, where they search for clues about the true nature of the Primordial Son of Chaos.
I'm not sure it is a particularly popular fanfiction genre. While the Percy Jackson series has a large and passionate fanbase, the idea of him being 'born a primordial' is quite different from the established lore in the books. It could potentially be popular among those who like to explore very different interpretations of the character, but it's not likely to be as popular as fanfictions that stay closer to the main themes and storylines of the original series.
Nyx, the goddess of the night, is quite popular in fanfictions. Her dark and mysterious nature makes her an appealing character. Writers can play with her powers, such as her control over the night, dreams, and all the things that lurk in the darkness. She can be portrayed as a powerful and independent figure, or she can have complex relationships with other gods or demigods. Erebus, the god of darkness, is also a favorite. His connection to Nyx and his role in the primordial cosmos offer a lot of material for fanfiction writers. He can be a source of great evil or a misunderstood figure trying to find his place in the world of the story.
One common theme is the struggle between chaos and peace. Since the Primordial of Peace is involved, there's often a contrast with forces that want to disrupt the peace. Another theme is the discovery of new powers. Characters often find out they have some connection to the Primordial of Peace and have to learn to use these powers.
Well, Percy Jackson himself is likely to be one of the main characters. He would probably be involved in the story given the 'Percy Jackson' part of the title. He might be facing new challenges related to the Primordial of Earth.
If Percy Jackson became a primordial in fanfiction, he would be a force to be reckoned with. Primordials are extremely powerful entities. Percy's transformation could lead to him having the ability to reshape the world according to his will. He could potentially create new realms or change the laws of nature. His personality might also shift, becoming more detached and otherworldly as he adapts to his new primordial state. This would make for a very interesting plot as the other characters try to deal with this new Percy.