If the story takes a more psychological turn, Fem Canada's own internal demons or insecurities could be the main antagonist. For example, if she has self - doubt that is preventing her from escaping Prussia's clutches, or if she has some past trauma that is resurfacing during the kidnapping, making it harder for her to fight back. In this case, Prussia's kidnapping is just the external situation that triggers her internal struggle.
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.
Perhaps Prussia is acting on behalf of another nation or group in the fanfiction world. He kidnaps Fem Canada as a political move. He might believe that by having her in his control, he can gain an advantage in the complex web of international relations in this fictional scenario. For example, he could use her as a bargaining chip with other countries.
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.
The main characters are Prussia and Canada. Prussia could be depicted as a bit of a maverick in the curling world, always looking for new challenges. Canada would be the more traditional and methodical curler. There might also be a character like Canada's beaver mascot which could be a fun addition, adding some comical moments. And Prussia might have a sidekick from his own country who doesn't quite understand his sudden interest in Canada and curling, which could create some sub - plots.
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.
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.
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.
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.
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.
It could be Aizawa himself if he's being controlled by something or has some sort of ulterior motive that is not in Izuku's best interest. But if not Aizawa, then there could be a hidden villain who is manipulating Aizawa to kidnap Izuku.