One common theme could be friendship. Since these are likely to be characters in some kind of story, they might form strong bonds. Another could be adventure, if they are in a world where they have to face challenges together.
Well, without more context about who Peter, Steve, and Bucky are in this fanfiction context (if they are from a particular movie, book or game), it's hard to recommend specific fanfiction. However, you can look for them on fanfiction.net as well. Browse through the different categories related to the possible source material they could be from. Maybe start with general tags like 'adventure' or 'friendship' if you're not sure what kind of story you want.
One common theme is mentorship. Steve, with his wealth of experience, often takes on a mentorship role for Peter. For example, in many stories, he teaches Peter about leadership and responsibility.
One common theme is mentorship. Steve often acts as a mentor to Peter, guiding him through difficult situations. For example, in many fics, he helps Peter understand the responsibilities that come with his powers.
One common theme is mentorship. Steve, with his more experienced nature, can act as a mentor to Peter. Another theme is friendship. They can form a strong bond based on mutual respect.
One common theme is mentorship. Tony and Steve often act as mentors to Peter, guiding him in his superhero journey. For example, they might teach him new combat techniques or how to make better decisions in difficult situations.
Mentorship is also a common theme. Steve, being the more experienced one, mentors Baby Peter in various aspects. It could be in combat skills if it's in a superhero - related setting, or just in general life skills. Additionally, the theme of friendship often underlies these fanfictions. Even though there is an age and experience gap, they form a deep friendship that is central to the story.
The theme of trust is quite common. After being saved by Steve, Peter has to trust Steve completely. This can be shown in various ways, like Peter following Steve's orders during a dangerous situation. And there's also the theme of growth. Peter grows as a hero and as a person after the rescue. He might become more confident or learn new skills from Steve, which is often explored in these fanfictions.
The theme of heroism would be prominent. They both represent different aspects of heroism. Steve is the all - American hero from the past, and Peter is the modern - day, street - level hero. Their combined heroism could be explored in the fanfiction. Also, the theme of sacrifice might come up. They both have sacrificed a lot in their superhero lives.
In 'Steve and Tony are Peter's parents' fanfiction, the theme of identity is quite common. Peter has to figure out his place in this new family dynamic that involves two very different 'parents'. There's also the theme of sacrifice. Steve and Tony may have to sacrifice some of their superhero activities or personal desires to be good parents to Peter. And of course, love is a central theme. Their love for Peter and for each other as partners in raising him is often explored in great detail in these fanfictions.
Adventure is also a popular theme. Writers like to put Danny and Steve in new and exciting situations where they have to use their skills and rely on each other. For example, they might be on a dangerous treasure hunt or facing a powerful enemy.