Love triangles can also be a common theme. Sometimes the OC gets caught in a love triangle between Bucky and Steve, which adds a lot of drama and tension to the story. And of course, there's the theme of heroism. The OC might be inspired by Bucky and Steve's heroism and try to find their own way to be a hero in the story.
One common theme is friendship. The OC often becomes a part of the friendship between Bucky and Steve, either strengthening it or causing some temporary rifts that they have to overcome. Another theme is redemption. Bucky, with his complex past, may find a new path with the help of the OC and Steve.
Another theme is the power of love. Since it's about soulmates, the love between Steve, Bucky and the OC is often portrayed as something that can overcome great obstacles. It could be things like political differences in the world of the Marvel universe or personal insecurities of the characters.
One common theme is loyalty. Steve and Bucky have a deep loyalty to each other that is often explored. For example, in many fics, Bucky will go to great lengths to protect Steve and vice versa.
Friendship is a very common theme. These three characters often form a strong bond in fanfiction, relying on each other for support, whether it's during battles or in dealing with personal issues. For example, in many stories, they help each other overcome their past traumas.
A prevalent theme is also sacrifice. Each of them is willing to sacrifice for the others in many fanfictions. It shows how deep their bond is. And the theme of trust is also there. They need to build and regain trust among themselves, especially given all the things that happen in the Marvel universe.
One common theme is loyalty. In these fanfictions, Bucky and Steve are often shown as being extremely loyal to each other, through thick and thin. For example, they might go to great lengths to protect one another from various threats.
One common theme is loyalty. Their long - standing friendship and the lengths they would go to for each other are often explored. For example, in many fics, Bucky will always be there for Steve no matter what, and vice versa.
One common theme is friendship. They are often shown building a strong bond despite their differences. Another is redemption, especially for Bucky considering his past. And teamwork is also a big theme as they are all part of the Avengers.
Love and romance can also be a theme. Sometimes the OC and Bucky develop romantic feelings for each other. Additionally, adventure is a big theme, with the two characters going on various exciting missions or quests together.
Another common theme is loyalty. They are extremely loyal to each other. In some fanfics, they'll go to great lengths to protect one another, even if it means going against the whole world. It's a very powerful aspect of their relationship that writers often explore.
One common theme is loyalty. Steve and Bucky have a deep loyalty to each other that has withstood time and trauma. Another is redemption. Bucky's journey from being the Winter Soldier to finding himself again is often explored. Friendship is also a big theme, as their bond is one of the most important aspects of their relationship in these fics.