Baron Zemo could be a great main villain. He could be plotting to create chaos between the two heroes. He might use his intelligence to set up situations where Captain America and Black Widow suspect each other, all while he is working on a larger scheme to take over a powerful weapon or organization.
The Red Skull could make a comeback in this fanfiction. He could be working from the shadows, manipulating events to draw Captain America and Black Widow into a trap. His goal could be to use their combined powers for his own evil purposes, or perhaps to destroy them once and for all, seeing them as threats to his plans for world domination.
A new villain, an evil scientist named Dr. Nexus, could be created for this fanfiction. He has developed a serum that can control minds and he wants to use it on the world's leaders. Captain America and Black Widow get in his way, and he uses his advanced technology and army of genetically enhanced minions to try and stop them from ruining his 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.
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.
Another possibility is a fanfiction set in an alternate universe. In this universe, Captain America and Black Widow are not part of the Avengers. Instead, they are partners in a detective agency. They solve crimes that are related to super - powered individuals, using their own unique abilities and intelligence.
In the fanfiction, their relationship could be complex. They've been through so much together as comrades in the Avengers. As parents, they might have different parenting styles. Captain America could be more open and idealistic, while Black Widow is more cautious and practical. But they both love their child deeply and work together to keep the child safe from the threats that come from their superhero lives. For example, when the child wants to join a mission too early, they have to work out how to handle it as a couple.
One great 'Black Widow and Captain America' fanfiction is 'Shadows of the Past'. It delves into their past missions together and how those experiences shaped their relationship. It has a great mix of action and emotional depth.
Perhaps a story where Black Widow is injured badly on a mission. Captain America refuses to leave her side and takes care of her. During her recovery, they have heart - to - heart conversations that lead to a new level of understanding and friendship, which then evolves into a romantic relationship.
Captain America himself is a great character to pair with Black Widow. Their dynamic in the movie was interesting, and in fanfiction, it could be further explored, like them having more in - depth conversations or relying on each other in different ways. Falcon is also a good choice. He and Black Widow could team up for a mission that requires both his flying abilities and her espionage skills. Another option is Nick Fury. A fanfiction could show their interactions behind the scenes and how they plan strategies together during the events of Captain America 2.
A good antagonist could be a rogue S.H.I.E.L.D. agent who has his own plans for power. He might see Captasha and Black Widow as threats to his scheme. This agent could have access to some high - tech weapons and a group of loyal but misled followers.
In the comics, Captain America and Black Widow are not typically depicted as a couple. They have a professional relationship based on their roles as superheroes within the Marvel universe.
In fanfiction, the relationship between Captain America and Black Widow can be complex. Sometimes it's portrayed as a deep friendship with mutual respect. They've been through many battles together and understand each other's strengths and weaknesses on the battlefield.