Who could be the main antagonists in 'percy becomes the assassin of chaos fanfiction'?

A likely main antagonist could be a powerful demigod who has turned to the dark side and wants to use chaos for his own evil purposes. He might see Percy as a threat to his plans.

The Titans could still be antagonists. Even though Percy is raised by Chaos, the Titans might see him as a threat to their plans of overthrowing the Olympians. They could try to capture or kill him to prevent him from interfering.

Well, perhaps Percy starts off as an ordinary character but gets drawn into the chaos realm. He could be forced to become an assassin due to some threat to his friends or family. Maybe he discovers new powers that make him suitable for this role.

The Titans could be the main antagonists. They might oppose Percy's ascension to Olympian status because they see it as a threat to their own plans of overthrowing the Olympians.

It could be some of the other trainees who are jealous of Percy's progress and his special relationship with Chaos.

The Titans could still be a major threat. Since Percy is now the Host of Chaos, they might see him as a new opportunity to regain power. Kronos could try to manipulate Percy's chaotic powers for his own gain, or maybe use Percy's new status to cause more chaos in the world and then step in to 'restore order' in a way that benefits the Titans.

The Titans could be great antagonists. They might see Percy as a threat to their plans of overthrowing the gods again. Since Percy has chaos powers, they could fear that he could disrupt their carefully laid - out schemes. Another possibility is some of the more traditional enemies of the demigods, like the monsters. They might be drawn to Percy's chaotic energy and try to either consume it or destroy him to prevent him from becoming too powerful.

It could be a group of mythical creatures that have been experimented on by Shield. They've become more powerful and angry, and they see Percy as a threat. They target him and try to destroy him, as well as causing chaos within Shield. These creatures could be something like mutated centaurs or enhanced harpies.

The Titans might still be a threat. Even though they were defeated before, they could have some remnants or followers who don't want Percy to become an Olympian because it would strengthen the Olympian side even more.

The Titans could be the main antagonists. They might see Percy becoming a guardian of the Hunt as a threat to their plans. Since the Hunt has its own power and influence, the Titans would want to disrupt it. They could send their minions to attack the Hunt, and Percy would have to use his skills and newfound position to fend them off.