A possible plot for a 'Hydra Kidnaps Darcy' fanfiction could involve Darcy's sassy attitude getting on the nerves of her Hydra captors. This could lead to some humorous exchanges while still maintaining the tension of the situation. Meanwhile, the Avengers are frantically searching for her. Captain America might use his leadership skills to coordinate the search efforts. Back with Darcy, she could try to form an alliance with other captives in the Hydra base. Together, they could come up with a plan to revolt against their captors and escape before the Avengers arrive.
She might survive by making use of her relationships. For instance, if she has some sort of connection with Loki (maybe from past encounters), she could call out to him telepathically (if there's some sort of magic involved). Loki, being the trickster he is, could then come and rescue her. Another way is that Darcy could use her knowledge of science to create a makeshift weapon or a device that would help her escape from Hydra's clutches. She could use the materials available in her cell to build something useful.
Perhaps in the 'avengers of hydra fanfiction', Hydra has developed a new super - weapon that can neutralize the Avengers' powers one by one. The story could follow the Avengers as they scramble to find a way to counter this weapon while also dealing with Hydra's attacks on various cities. Or, there could be a plot where a powerful Hydra agent uses magic to possess some of the Avengers and make them do Hydra's bidding, and the remaining Avengers have to find a way to break the spell.
Perhaps the kidnapping is part of a larger plot by an enemy of both the Winter Soldier and Darcy's friends. The Winter Soldier might be used as a tool, and Darcy could end up being the key to breaking his brainwashing. She could start to form an unexpected connection with him during her captivity, leading to a change in both of their fates.
One idea could be a character with the Hydra Bloodline having the ability to split into multiple versions of themselves during battles, like the Hydra in mythology. Each split could have a different combat skill, making it a very unique fighting style.
Well, a possible plot could be that the Hydra experiment was actually a cover - up for a much larger and more sinister plan. The Avengers discover that the experiment was just the tip of the iceberg and they have to race against time to stop Hydra from unleashing something far worse. It could also be interesting if the experiment somehow gives an ordinary person the ability to see into the future, and that person becomes a key figure in the battle between the Avengers and Hydra.
One plot idea could be that Kol kidnaps Caroline because he wants to use her as bait to draw out Klaus. He might think that Klaus has a soft spot for Caroline and will come running to save her. Another idea is that Kol is actually in love with Caroline in his own twisted way and kidnaps her to force her to see his side of things, away from the influence of her friends in Mystic Falls.
One plot idea could be that Gohan's friends, like Krillin and Bulma, team up to rescue him. They might use some of Bulma's inventions to track Raditz. Another idea is that Gohan manages to outwit Raditz during the kidnapping. Maybe he uses his hidden power to escape Raditz's clutches briefly and leaves a trail for his father Goku to follow.
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.
One plot idea could be that Captain Hydra, in a universe where he exists, tries to recruit Tony for his evil plans by appealing to Tony's scientific curiosity with some dark technology. Another could be a scenario where Tony, initially unaware of Captain Hydra's true nature, teams up with him for a project but slowly discovers the truth and has to fight against him. Or perhaps a story where they are both caught in an alternate dimension and must work together, reluctantly in Tony's case, to find a way back home while Captain Hydra keeps trying to undermine Tony's good intentions.
Well, a cool plot could be Darcy discovers a hidden power within herself while being around Loki. Loki, intrigued by this, decides to help her master it. Along the way, they face challenges from both Asgard and Earth. Maybe some Asgardians think Darcy is a bad influence on Loki and try to separate them. Meanwhile, on Earth, SHIELD is also suspicious of their alliance. It could lead to a lot of action and some unexpected friendships and romances.