Growth is also a prevalent theme. Bucky has to grow as a person to take care of the baby. He learns new skills, like cooking baby food or soothing the baby when it cries. He also grows emotionally, becoming more open and less guarded. In some stories, this growth extends to his relationships with his friends as well.
One common theme is redemption. Bucky often has a troubled past, and the presence of a baby gives him a chance to start anew and be a better person. For example, in many stories, he tries to atone for his past actions by being a loving and protective father.
Family is another big theme. The baby becomes part of Bucky's new family, whether it's just him and the baby or including the other Avengers as an extended family. They support each other and create a loving environment. Like in some fanfictions where the Avengers help Bucky decorate the baby's room.
One common theme is redemption. Bucky has a dark past as the Winter Soldier, and often in fanfiction, the reader helps him find redemption. Another theme is love. It can be a slow - burn love story between the reader and Bucky. And there's also the theme of acceptance, as Bucky has to accept who he is now after all he's been through, and the reader is often there to support him in that journey.
One common theme is redemption. Bucky Barnes has a complex past, and in many OC fanfictions, the OC helps him in his journey of redeeming himself. For example, the OC might be someone who has also faced hardships and can understand his pain.
The theme of acceptance is quite common. Bucky is different because of his past and his enhanced abilities. In fanfiction, the female character is often the one who accepts him fully for who he is. Also, themes related to family can be found. The female might introduce Bucky to a new sense of family or be part of his journey to reconnect with his own lost family.
A common theme is trauma. Bucky has endured so much, from being brainwashed by Hydra to all the violence he was forced to commit. His struggle to come to terms with that trauma is often explored. Another theme is redemption. Fans like to write about him trying to make up for his past actions, even though they weren't his fault. Healing is also a big theme, both physical and emotional healing from all the pain he's suffered.
One common theme is redemption. Bucky has a dark past due to his time as the Winter Soldier, and the OC often plays a role in helping him find redemption. For example, the OC might encourage him to face his past actions and make amends.
The theme of acceptance is also prevalent. Bucky has to accept this new role of being a father - to come to terms with his own self - image in relation to the baby. And also, the people around him have to accept this new phase in his life, which can lead to some interesting plot developments and character interactions.
Trauma and recovery are very common themes. Given his history of being experimented on and used as a weapon, fanfics often deal with how he copes with his past traumas. Love is also a theme. Sometimes it's romantic love, where Bucky finds someone who can accept him for who he is, with all his flaws.
One common theme is redemption. For example, Fem Bucky Barnes might be trying to atone for something from her past, and Tony, with his own complex history, can relate to her struggle. They help each other on their paths of redemption.
Since I can't really promote 'lemon' content, but in general fem Bucky Barnes fanfiction might have themes of self - discovery. The character, whether male or female - presented as female here, might be exploring their new identity in different ways. It could be about adapting to a new world or situation.
One common theme is the OC helping Bucky deal with his trauma. Given his past as the Winter Soldier, many fanfics explore how an OC with certain skills or a kind heart can aid him in his recovery. Another theme is adventure. The OC might join Bucky on various missions, whether it's related to the Avengers or something more personal. And of course, there's the theme of friendship or romance, depending on how the writer wants to develop the relationship between Bucky and the OC.