Who could be the main antagonists in a 'Percy Jackson Son of Thanatos' fanfic?

Another option could be some rogue demigods who are jealous of the son of Hades' powers. They might form a group and try to cause trouble for him and Percy Jackson. They could be working with some minor gods who have a grudge against Hades, creating a complex web of enemies.

The Titans could be the main antagonists. Even though they were defeated before, they might see Percy as a threat because of his powerful parentage. They could try to stop him from fulfilling a prophecy or gaining more power. For example, Kronos might have some remaining influence and try to manipulate events to destroy Percy.

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.

The main antagonists could be the Titans. They are powerful enemies in the Percy Jackson universe already. Now that Percy has Superman - like powers, they might see him as an even greater threat to their plans of overthrowing the gods. So, they would do everything in their power to stop him.

The Titans could be great antagonists. Since they once rebelled against the gods, they might see Percy, as the son of Selene, as a threat to their plans of regaining power. They could try to capture him to use his connection to Selene for their own dark purposes. For example, Kronos might want to use Percy's powers to control the moon and disrupt the balance of the world further.

The Titans who don't want Rhea to gain more power through Percy could be antagonists. Kronos, for example, might see Percy as a threat to his own plans for domination.

Another option could be some power - hungry demigods. They might not like the idea of Percy, as the son of Themis, having the potential to bring real justice to the demigod world. They could try to undermine him at every turn, creating all sorts of obstacles for him in his quests.

The Titans could still be a major threat. They might see Percy's new - found power as a way to finally overthrow the gods and use him as a weapon. Kronos, if he were to somehow be resurrected again, would be a formidable antagonist.

The Titans who were once allied with Atlas could be antagonists. They might see Percy as a threat since he is Atlas's son and could potentially stand in their way of regaining power. Kronos' followers who still hold grudges against the Olympians and by extension, Percy, could also be main antagonists.

The Giants could be great antagonists. Since Percy is now connected to Juno, they might see him as a key figure to target in their war against the gods. They could try to use his new identity against him and the other demigods.