Another theme is friendship turning into something deeper. A lot of stories show how their initial camaraderie in the Avengers team gradually blossoms into a romantic or a very close, almost family - like relationship. For example, they start to understand each other's insecurities and support each other through tough times.
One common theme is the power of their intellects combined. They are both brilliant minds, and fanfictions often explore how their ideas can create amazing things when they work together.
The theme of redemption can also be found. In some fanfictions, Tony or Bruce may have made mistakes in their past, and their relationship with each other becomes a way for them to find redemption. They help each other grow and become better versions of themselves.
Often, the theme of trust is explored. Given their different personalities, building and maintaining trust can be a big part of the stories. Tony is more flamboyant and Bruce is more reserved, so how they come to trust each other completely is an interesting aspect. And of course, the theme of innovation, as they are both brilliant minds constantly coming up with new ideas.
Friendship is also a big theme. Since they are all part of the Avengers universe, many fanfictions explore how their different personalities can form a strong bond. Tony's wit, Bruce's intelligence and Bucky's quiet strength combine in unique ways to create interesting friendship dynamics.
A common theme is friendship. Since they are all part of the Avengers, many fanfictions explore how they form strong bonds despite their differences. For example, in some stories, Bucky's past trauma is healed through the support of Bruce and Tony.
One common theme is protection. Tony often takes on the role of protecting Bruce in these fanfictions, especially when Bruce is in his ageplay state. Another theme could be discovery, as Tony discovers new aspects of Bruce's personality through this ageplay situation.
One common theme is the exploration of their intellectual connection. Since both characters are brilliant in their own ways in the original Marvel universe, fanfics often delve into how their minds interact when one of them is female. Another theme could be the relationship development, from initial acquaintance to something more romantic or platonic.
A common theme is the battle between good and evil. Bruce represents the good, while Jerome is the chaos - loving villain. Their interactions often revolve around this contrast.
A common theme is the exploration of an unlikely friendship turning into a romantic relationship. Since they might seem like different characters at first, seeing how they grow closer is popular.
One common theme is the exploration of opposites attract. Bruce is often seen as a man of science, very controlled (when he's not the Hulk), while Loki is a god of mischief. Their different natures make for an interesting dynamic.
Another theme is the development of romantic feelings. This often starts from a simple friendship or acquaintance. The stories might show how they gradually realize their feelings for each other, like blushing at accidental touches or getting jealous when the other is around someone else. It's a sweet and often - explored theme in this type of fanfiction.
The theme of mutual respect is also prevalent. Bruce respects Thor's power and Thor respects Bruce's intelligence. In many fanfictions, this mutual respect is what allows them to work together effectively. For instance, in 'Respect and Alliance' fanfiction, their respect for each other is the key to saving the universe from a great threat.