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.
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.
Captain Hydra's character could be developed by exploring his past and what led him to become the way he is. This could include things like a difficult childhood or a betrayal in his past that made him turn to the dark side. Tony's character development could involve him learning to not always rely on his technology but also on his wits and strategic thinking when facing Captain Hydra. He could also develop more compassion as he tries to understand what drives Captain Hydra to be evil. Additionally, their interactions could be used to develop both characters. For example, Captain Hydra's taunts could make Tony more determined, and Tony's comebacks could make Captain Hydra more enraged and vengeful.
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 idea could be that Naruto and Captain Marvel are brought together by a powerful cosmic force. They have to combine their unique abilities, Naruto's ninja skills and Captain Marvel's superpowers, to defeat a common enemy that threatens both their worlds. For example, a powerful alien race that is draining chakra from Naruto's world and energy from Captain Marvel's universe.
A plot could involve Goku and Captain Marvel being on opposite sides of a moral dilemma. For example, Goku might be more focused on a pure battle for the sake of getting stronger, while Captain Marvel is more concerned with protecting the innocent. This conflict could lead to some intense battles between them at first, but then they discover a greater threat that makes them see eye - to - eye. Also, they could be in a story where they are both summoned to a strange new world and have to rely on each other to find a way back home. Maybe they find a powerful artifact there that has the power to change the balance of power in their respective universes.
One idea could be that Tony and Black Panther team up to create a new type of technology that can enhance Wakanda's defenses even further. They combine Stark Industries' advanced weaponry concepts with Wakanda's vibranium - based technology.
Another plot could be that Jarvis, in his human form, discovers a long - hidden secret about Tony's past. This secret could potentially change their relationship. He has to decide whether to keep it hidden or reveal it to Tony, and this internal struggle forms the core of the story.
Another plot could be a time - travel scenario where Jack Sparrow somehow gets sent back in time and has to deal with a younger Captain Salazar before he became so vengeful. This could lead to a complex relationship as Jack tries to change the future.
One idea could be that Peter Pan and Captain Hook are forced to team up to save Neverland from a new, greater threat. Maybe a dark magic is spreading and they have to put aside their differences. Another could be a backstory exploration where we learn that they were once friends and something drove them apart. For example, a misunderstanding about a shared treasure or a girl they both liked in their past.