One possible plot could be that they meet in an alternate universe where timelines have merged. Captain Carter and Captain America initially have a bit of a misunderstanding as they come from different versions of heroics. But then they realize they share the same values of justice and freedom. They team up to fight a common enemy that is threatening both their worlds, like a powerful time - traveling villain who wants to rewrite history to suit his evil plans.
Red Skull could be the villain. Since he has a long history with Captain America, in a fanfiction where Captain Carter is involved, he could be resurrected or have found a way to cross over from another dimension. He would see Captain Carter as an interesting new threat and Captain America as an old foe to be finally defeated.
Well, one possibility could be that they team up to fight a common enemy. Maybe a powerful villain has emerged that neither of them can take on alone. They start off not trusting each other fully, Wolverine being the lone wolf type and Captain America used to leading his own team. But as they face challenges together, they learn to respect each other's skills and eventually become great allies.
One possible plot could be that Captain America and Black Widow are on a mission to retrieve a powerful and dangerous artifact. Along the way, they face numerous enemies and have to rely on each other's skills. Cap's super strength and leadership combined with Black Widow's stealth and combat skills make them a formidable team. They also start to understand each other on a deeper level, sharing stories from their pasts and building a stronger bond as comrades.
Well, they might start off as a bit cautious around each other. Captain America could be impressed by Superman's superpowers which are on a whole different level compared to his own enhanced human abilities. They could end up teaming up to fight a common enemy, like an alien invasion or a super - villain who is too powerful for either of them alone.
In a 'Harry Potter meets Captain America' fanfiction, perhaps they could team up to fight a common enemy. Maybe Voldemort and Hydra form an alliance, and Harry with his magic and Captain America with his super - soldier skills have to combine their forces. For example, Harry could use his invisibility cloak to help Captain America in a stealth mission against the joined forces of the Death Eaters and Hydra agents.
One possible plot could be that Naruto, being a big fan of Captain America, starts to incorporate Captain America's values into his ninja way. For example, he might be inspired by Cap's sense of justice and unwavering loyalty. He could start training his friends in Konoha to be more like a team in the way Cap leads the Avengers, emphasizing unity and self - sacrifice. Naruto might also create his own version of Captain America's shield using chakra, and use it in battles against powerful enemies.
One idea could be Captain America arriving on Themyscira and being initially met with suspicion by the Amazons. But as they learn of his values of justice and courage, they start to respect him. He could then train with the Amazons, sharing his combat techniques while also learning from their unique fighting styles.
No, Sharon Carter did not become Captain America in the comics.
In a fanfiction scenario, Nico di Angelo and Captain America could team up. Nico could use his shadow - traveling abilities to get them out of tight spots. Captain America would bring his leadership and combat skills to the table. Their meeting might also lead to some interesting cultural exchanges, as Nico comes from a world of Greek mythology and Captain America from a more modern, American - military background.
The theme of sacrifice is also quite common. Steve sacrificed his life (or so he thought) by crashing the plane. Peggy sacrificed her personal life to a great extent for the SSR and the fight against Hydra. Fanfics will often put them in new situations where they have to make more sacrifices. And then there's the theme of time. The fact that Steve was frozen for decades while Peggy aged is a rich area for exploration in fanfics. They deal with how time has changed them and yet how some things between them remain the same.