Captain America would probably remain calm at first. He's used to being in tough situations. He'd try to talk to Loki, reason with him, and find out what Loki wants.
Perhaps Loki kidnaps Captain America to prove a point. He may believe that the so - called 'good guys' are not as invincible as they seem. He could subject Captain America to various mental challenges, trying to break his will and show the world that even the most noble heroes can be corrupted. But Captain America's strong moral compass will likely make it very difficult for Loki to succeed.
The theme of unlikely alliances also prevails. Given their different origins and natures, the idea of Captain America and Loki teaming up is exciting. It's about how they overcome their differences and use their combined strengths to face various challenges in the story.
One possible scenario in this fanfiction could be that Loki disguises himself and lures Spiderman into a trap. He then transports him to a different realm where Spiderman is completely out of his element. Spiderman would have to rely on his wits and basic powers to try and escape Loki's clutches.
One great 'captain america x loki fanfiction' is 'The Unlikely Alliance'. It explores how Captain America's sense of justice and Loki's mischievous nature collide and eventually lead to an unexpected friendship. They team up against a common enemy and in the process, learn a great deal about each other's worlds.
One idea could be a story where Captain America and Captain Marvel team up to face a new cosmic threat that's headed towards Earth. They have to combine their unique skills, with Captain America's strategic mind and combat experience on the ground, and Captain Marvel's incredible cosmic powers in space battles.
One possible outcome in this fanfiction could be that Loki kidnaps Darcy for a very specific reason. Maybe he needs her knowledge of some scientific concept that is relevant in the world he is from or is planning to use in his schemes. For example, if Darcy has been working on some sort of energy research that Loki believes can be harnessed for his own power - enhancing purposes.
If Loki kidnaps Spiderman in fanfiction, it would be a very interesting plot. Loki is a powerful and cunning character, while Spiderman is a beloved hero. Loki might underestimate Spiderman's resourcefulness though. Spiderman could use his spider - sense to find weaknesses in Loki's plans.
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.
At first, Bruce might be scared. He knows Loki's reputation for being unpredictable and dangerous. But he also tries to keep his cool because he doesn't want to accidentally transform into the Hulk right away. He might try to reason with Loki, using his intelligence to talk his way out of the situation.