A really interesting plot could involve Percy being in a situation where he has to use the powers he inherited from Gaea to save the world from a new and greater threat. However, the other demigods don't trust him at first. So he has to not only fight the external threat but also earn the trust of his comrades. He might discover ancient secrets about Gaea that could either doom or save the world, and he has to make a difficult choice based on that knowledge.
His relationships with his old friends would be strained. They might be wary of him at first. For example, Annabeth might be very cautious around him as she's not sure if he can be trusted. But over time, if Percy proves himself, they could slowly rebuild their friendship.
One common theme is identity struggle. Since Percy is known as the son of Poseidon in the original, being the son of Gaea in fanfiction makes him question who he really is. Another theme is power and its consequences. With a different origin, he has different powers and has to deal with how they affect him and those around him.
This is a really interesting concept. In the original Percy Jackson series, Percy is the son of Poseidon. But in this fanfiction idea, if he were the son of Gaea and Tartarus, it would completely change his character and the story. His powers would likely be much darker and more primal. He might have an in - depth connection to the earth and the abyss, which could lead to some really unique storylines.
Yes, there are quite a few. You can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Some might explore Percy's unique heritage as the son of both Gaea and Poseidon and how it affects his relationships with other characters in the Percy Jackson universe, like his friends at Camp Half - Blood or his enemies.
In a fanfiction, Percy could face other demigods who are suspicious of him because of his relation to Kronos. He'd have to prove that he's not going to follow in Kronos' evil footsteps. Maybe he teams up with some unlikely allies, like a child of a minor god, to show his loyalty to the good side.
Gaea herself would obviously be a main antagonist. She has the power to manipulate the earth and all its forces against Percy. Her children who are fully committed to her cause could also be major antagonists. They might have powers related to the earth and be very difficult for Percy to defeat.
One possible plot could be Percy's discovery of his true parentage. He might struggle with the implications of being the son of two powerful primordial deities. For example, he could face a conflict between the forces associated with Ouranos and Gaea. This could lead to him having to make difficult choices about which side to support, if any. And he may also have to deal with the reactions of his friends and the other demigods who might view him differently now.
One possible plot could be Percy discovering his true parentage as Gaea's eldest son and struggling with the implications. He might have to face the wrath of the other demigods who see Gaea as an enemy. For example, he could try to convince his friends like Annabeth that he is still on their side despite his newfound origin.
Well, there's 'Percy Son of Gaea: A New Path'. In this fanfiction, Percy has to face a lot of challenges that are different from the original series as he is now the son of Gaea. It shows his struggle to find his place in a world that sees him as a threat at first. And 'Percy's Gaea - Bound Destiny' is also quite good, with a detailed exploration of how Percy's relationship with Gaea could change his relationships with his friends.