Who could be the main antagonists in a 'Percy Jackson, Abandoned Son of Artemis' fanfiction?

The Titans could still be antagonists. Even though Percy is now associated with Artemis, the Titans might see him as a threat or a tool to use against the gods. Kronos, for example, could try to turn Percy to his side by offering him power or by threatening those he cares about in Artemis's group.

One possible antagonist could be an old enemy of Percy's who has a vendetta against his son. For example, a powerful Titan who was once defeated by Percy might see the silver son as a way to get revenge. They could try to corrupt the son or use him against Percy and his friends.

The Titans could be the main antagonists. Even though they have been defeated before, some of them might have found a way to return or their followers could be causing trouble. They see Artemis as a threat or a target for their revenge against the gods. Another possibility is a new group of powerful monsters that have banded together and are specifically targeting Artemis for her power and influence among the demigods.

The Ministry of Magic could be the main antagonists. Since Harry is the abandoned son of Artemis, they might see him as a threat to the stability of the wizarding world. They could try to suppress his powers and keep his identity a secret.

One possible plot could be Percy finding out he's the son of Artemis in a very unexpected way. Maybe he has some powers related to the moon that start to manifest. He could be shunned by the other demigods at first because it's so unheard of for Artemis to have a son. Then he goes on a journey to find out more about his mother and his place in the demigod world.

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.