The theme of friendship also runs strong. As Bucky protects Tony, they start to form a bond that goes beyond just protection. They become friends who support each other through various difficulties. Additionally, there's often the theme of sacrifice. Bucky is willing to put himself in harm's way to protect Tony, showing his selfless side.
One common theme is redemption. Bucky has a complex past and Tony often has to come to terms with that. Another theme is friendship. They are two very different characters but in fanfic they often find common ground and become friends.
Healing is another common theme. Both characters usually have their own emotional wounds. In these fanfics, through their relationship of adoption, they help each other heal. For example, Bucky's stability can help Tony deal with his insecurities, and Tony's intelligence and humor can help Bucky come to terms with his past.
The theme of forgiveness is also prevalent. Given their history, with Bucky being involved in the death of Tony's parents, forgiveness is a big part of their relationship in fanfics. Some stories show how difficult it is for Tony to forgive Bucky, while others show how Bucky tries to earn that forgiveness.
One common theme is protection. Bucky and Steve often see Tony as someone who needs safeguarding, whether it's from physical threats during missions or from the emotional harm caused by his past. For example, in many fics, they'll stand up for Tony when others in the Avengers question his motives.
Forgiveness is also a big theme. Tony has to forgive Bucky for things he did while under Hydra's control. And in reverse, Bucky has to forgive Tony for any harsh judgments or actions towards him. There's also the theme of teamwork. They are both strong characters, and when they work together, they can achieve great things, like saving the world or solving complex problems in the fanfiction stories.
One common theme could be exploring the characters' past traumas in a new light. For example, in a fanfic with age regression, Tony might relive his experiences with his parents in a different way. It could also show a more vulnerable side of Bucky, perhaps his pre - Winter Soldier days. Another theme could be friendship and protection, as the other characters might take on a more protective role towards the regressed Tony or Bucky.
Friendship and love are also big themes. The relationship between the three can range from deep platonic friendship to romantic love. In some fanfics, they struggle to define their feelings for each other. They support each other through tough times like battles and personal crises, which shows their strong bond.
Friendship is a very common theme. Despite their differences, they come together and form a strong bond. Another theme is redemption. For example, Bucky might be seeking redemption for his past actions, and Tony and Steve play a role in that process.
One great 'bucky protects tony fanfic' is 'Shielded by the Winter Soldier'. In this fic, Bucky uses his combat skills and instincts to keep Tony safe during a series of dangerous missions. It has a great balance of action and character development.
Another theme is redemption. Sometimes the fight is a way for Bucky to try and redeem himself in Tony's eyes. He might face Tony head - on in the fight, hoping that by taking the punishment or showing his remorse, he can be forgiven.