It could be a rogue CIA agent. This agent might have his own motives for wanting Link kidnapped. Maybe he wants to use Link's abilities for personal gain, like selling his skills to the highest bidder. He would go against the CIA's official protocols just to get what he wants from Link.
The main antagonist could be the head of the CIA operation that orders Link's kidnapping. This person might be power - hungry and believe that Link can be used to gain more control or knowledge.
One possible plot could be that the CIA mistakes Link for a dangerous spy due to some strange mix - up. They might take him to a secret base and try to interrogate him about non - existent threats. Link, being the hero he is, uses his skills to try and escape while also trying to figure out why the CIA is after him.
Maybe the main antagonist is an ancient evil that has awakened. It has the power to manipulate Artemis's mind, making her kidnap Percy against her will. This evil entity wants to use Percy as a sacrifice to gain more power. So, while Artemis is the one who physically kidnaps Percy, the real force behind it, the ancient evil, is the true antagonist.
A powerful and corrupt organization might be the main antagonist. They blackmail Wade into kidnapping Peter. The organization wants to study Peter or use him as a bargaining chip. Wade is caught in a difficult situation where he has to protect Peter from this organization while also dealing with the fact that he has kidnapped him.
It could be that the real antagonist is the situation or the world they live in. For example, if they are in a post - apocalyptic world where resources are scarce, Paul might kidnap Bella to ensure his own survival or the survival of his group. In this case, the harsh environment is the main driving force behind the antagonistic act.
Another possible antagonist could be the new opera managers. They could be trying to use Christine's disappearance to their advantage, perhaps by spreading rumors that she has run away with a lover to create a scandal and boost ticket sales. They might also try to stop Raoul from searching for her, seeing it as bad for business.
Another possibility is that an old enemy of the Uzumaki clan resurfaces. They use Itachi's complex relationship with the village and his own motives to manipulate him into kidnapping fem Naruto. So, this old enemy would be the main antagonist as they are the ones driving the overall conflict.
It could be someone who is manipulating Loki to kidnap the Hulk. Maybe an even more powerful villain from the Marvel universe, like Thanos. He might be using Loki as a pawn to get the Hulk for his own evil purposes.
Prussia would likely be the main antagonist in this scenario since he is the one carrying out the kidnapping. His actions are against Fem Canada's will, which makes him the opposing force in the story.
Ganon could still be the main antagonist. His motives remain the same - to take over Hyrule. But now he might underestimate Link because she's a girl, which could be his downfall.
It could be another dark guild. They might be using Gray as a pawn to kidnap Lucy, perhaps because they know of her celestial spirit magic and want to use it for their own evil purposes. Gray may not be fully aware of their manipulation.