The theme of sacrifice also pops up. Their relationship is such that they might be willing to sacrifice themselves or their own interests for the sake of the other. This could be in the face of a powerful enemy or a difficult decision that has to be made for the greater good.
Power and responsibility is also a theme. Both Captain America and Iron Man have different views on how to use their power. Fanfictions often play with these ideas, showing how they might influence each other or find a middle ground. For example, some stories might have them debating about the best way to protect the world.
A third common theme is sacrifice. Fanfictions may depict situations where either Captain America or Iron Man has to sacrifice something for the greater good or for the sake of their relationship. It could be something as simple as sacrificing personal time to train together or as big as sacrificing a chance at personal glory to save the other.
One common theme is redemption. After their big fallout, many fanfics focus on how they can redeem themselves in each other's eyes. For example, they might save each other from dangerous situations.
One common theme is loyalty. Writers often explore how the members of Team Iron Man are loyal to Tony Stark and his vision for the Avengers. They show how this loyalty drives their actions during the civil war.
One common theme is the resolution of their differences. Since they had major conflicts in the movies, fanfic might use a kiss as a way to show them making up. Another theme could be the exploration of a hidden or suppressed love. Maybe in the story, they realize they have deeper feelings for each other that they've been ignoring.
One common theme is friendship. Since they are both heroes from the Marvel universe, fanfictions often explore how they become friends and support each other. Another theme is mentorship. Captain America, being from an older era, can sometimes be portrayed as a mentor to Spider - Man.
A recurring theme is the contrast between their personalities. Captain America is more of an old - fashioned, by - the - book hero, while Spider - Man is young and impulsive. Fanfictions often explore how they deal with this difference. Also, the theme of sacrifice is common. They both are willing to sacrifice themselves for the greater good, and this is often highlighted in the stories. For instance, in some fanfictions, one of them will put themselves in danger to save the other or civilians.
The theme of unlikely alliances also prevails. Given their different origins and natures, the idea of Captain America and Loki teaming up is exciting. It's about how they overcome their differences and use their combined strengths to face various challenges in the story.
One common theme is adventure. The OC might join Captain America on his missions, facing various villains and dangerous situations.
One common theme is loyalty. Captain America is all about loyalty, and in these fics, that loyalty extends to his relationship with the reader. For example, he'll always be there to protect the reader.