One common theme is patriotism. Since Captain America is a symbol of America, many fan fictions explore his love for his country and how he upholds its values. Another theme is friendship, like his relationships with Bucky Barnes and the other Avengers.
One common theme is the struggle to overcome physical injury. Captain America is often depicted as superhuman, but in these fanfictions, his human side shows through when he has to deal with pain and the process of healing.
One common theme is the clash of different ideologies. For example, when Captain America crosses over with a dystopian universe, his values of freedom and justice often conflict with the oppressive regimes there. Another theme is the exploration of friendship. When he meets characters from other franchises, they have to learn to trust and work together.
Friendship is a very common theme. Since they are both part of the Avengers, many fanfics explore how they become friends and support each other. For example, they might show Hawkeye cheering up Captain America after a tough battle.
One common theme is identity. Since she's Captain America's daughter, she often has to figure out who she is apart from her father's famous name. Another theme is legacy. She has to decide whether to carry on her father's work or forge her own path. Family is also important, like how she deals with the loss of her father or the relationship with her mother if she's in the story.
The theme of friendship and teamwork also comes up a lot. Since Captain America is often part of a team, OCs in fanfics are usually involved in relationships with other characters. They learn to work together, trust each other, and support one another. This can lead to some great character - driven stories where the OC's relationships with characters like Bucky Barnes or Sam Wilson are explored in depth.
One common theme is the exploration of how Captain America deals with the unexpected situation of pregnancy. It could be about his struggle to balance his superhero duties with his newfound role as a potential father.
One common theme could be loss. Captain America has lost so much, from his old life in the 40s to friends over the years. So, a fic might show him crying over the loss of a comrade or the world he once knew.
One common theme is the contrast between their ideologies. Batman is more of a lone vigilante with a darker view of justice, while Captain America is a symbol of patriotism and upholds a more idealistic view. Fanfics often explore how they bridge this gap.
A common theme is empowerment. Since it's a female version of Captain America, the stories often focus on her breaking gender barriers and proving herself in a male - dominated superhero world. For example, she might have to fight against sexist villains or deal with male characters who underestimate her at first.
Another theme is the sister's own journey of self - discovery. Since she's related to a famous hero, she has to find her own place in the world. This could involve her developing her own powers or skills, like learning martial arts to be able to protect herself and help her brother. It's about her growing as a person while being part of Captain America's story.