Growth and development are also common. The baby daughter grows up, and we see her character develop. It might include her learning about her father's heroic past, and how she decides if she wants to follow in his footsteps or make her own path. There could be a struggle between her normal life and the extraordinary world her father is part of.
Love is a prevalent theme as well. Captain America's love for his daughter is unconditional. This love can be shown through his actions, like staying up all night when she's sick or teaching her how to be a good person. And the daughter's love for her father can also be a driving force in the story, making her want to make him proud.
Family is a very common theme. Captain America, who has lost so much in his own life, often forms a new kind of family unit with the baby in these stories. Protection is also big, as he uses his skills to keep the baby safe from various threats.
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.
There could be a fanfiction where the baby daughter has some superpowers of her own, inherited from Captain America. In this type of story, it might explore how Captain America helps her control and understand her powers, all while keeping her safe from those who might want to use her for their own gain.
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.
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.
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.
One common theme is loyalty. Their loyalty to each other is often a central part of the stories. They've been through so much together and would do anything for one another.
Another theme is loyalty. Many OC fanfictions explore the loyalty that the OC develops towards Captain America and his ideals. This can be tested in various situations, like when facing a powerful enemy or when having to make a difficult choice between different loyalties. It adds depth to the relationship between the OC and Captain America.
One common theme is sacrifice. Captain America might have to sacrifice some of his superhero duties to take care of his pregnant partner. Another theme is protection. He will do everything to protect his partner and the unborn child from any threats. And there's also the theme of family values. It shows how important family is to him even in the middle of his superhero life.