Well, in Steve and Tony love fanfiction, a common characteristic is the emotional depth. Since they both have complex backstories and a lot of baggage, the fanfictions tend to dig deep into their feelings. It could be Steve's struggle with adapting to the modern world while falling for Tony, or Tony's fear of losing Steve due to his self - sacrificial nature. Also, there's the aspect of friendship - turned - love. They start as comrades in the Avengers, and the fanfictions show how that bond gradually transforms into a romantic one. This often involves a slow - burn type of relationship development which keeps readers engaged.
Characteristics of Steve and Tony love fanfiction include the use of their iconic elements. For Steve, it's his shield and his sense of justice, and for Tony, it's his Iron Man suit and his intelligence. Fanfictions often incorporate these into the love story, like Tony using his tech to create something special for Steve. Another characteristic is the inclusion of other Avengers. Their reactions to Steve and Tony's relationship can add more drama and depth. Some fanfictions also explore the time - travel or alternate universe concepts, which can give a fresh take on their love story, for example, showing what would happen if they met in a different timeline or universe.
One characteristic is the exploration of their contrasting personalities. Steve is often seen as the old - fashioned, morally upright hero, while Tony is the modern, brash and tech - savvy one. Fanfictions play with these differences and show how they complement each other in a relationship. Another is the use of the superhero context. Their love is often set against the backdrop of saving the world or dealing with super - villains. For example, they might have a moment of confession during a battle or while planning a mission.