The theme of sacrifice also appears. Both characters are known for their self - sacrifice in their respective storylines. In fanfics, this can be magnified when they are in a joint adventure. For example, they might be willing to put themselves in danger to protect each other or to achieve a greater good, like saving a city or the world from a powerful threat.
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.
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.
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.
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.
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 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.
Growth is a common theme. Since it's about a 'baby' Captain America, it often shows his journey of growing into the hero we know. Another theme is friendship, like his early bonds with Bucky. These fics might explore how those relationships were formed when he was younger.
The theme of leadership also often appears. Both are leaders in their own right. Fanfics might show how they lead together in a joint mission, or how they influence each other's leadership styles. For example, Wonder Woman's more ancient and mythical leadership might influence Captain America's modern - day approach, and vice versa.
A frequent theme is the idea of two heroes finding love and support in each other. Given their similar goals of protecting and doing what's right, it makes sense that in fanfic they would find a deeper connection. Also, the theme of overcoming differences, not just cultural but also in their powers and leadership styles, is quite common.
One common theme is trust. Given their different backgrounds, they need to learn to trust each other. For example, Captain America coming from a more idealistic past and Black Widow from a more shadowy world. Their stories often explore how they build that trust over time.
One common theme is resilience. Steve Rogers is known for his strong will, and in these fanfics, he shows great resilience in the face of cancer. Another theme could be the support of his friends. The Avengers or other characters in the Marvel universe coming together to support Steve during his illness.