It can strengthen their bond. Tony, who is often seen as the genius playboy billionaire philanthropist, might show a more nurturing side towards Bucky. Bucky, in turn, could see Tony in a new light, not just as the Iron Man but as someone who truly cares. This can lead to a deeper friendship.
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.
Well, it could severely strain their relationship. Tony might feel betrayed and hurt. He could start to question Steve's loyalty. Since Steve is ignoring him for Bucky, Tony might become resentful towards both Steve and Bucky. It could lead to a rift that's hard to mend in the story.
In the case of characters like Draco Malfoy, age regression could completely change his trajectory. He might not have the same prejudices if he were in a younger mental state. He could form new friendships, perhaps with characters from different houses. This would not only change his own development but also the way other characters view him. His relationships with his parents might also be affected, as he might show a side of himself that they haven't seen before, which could lead to either a closer bond or more conflict depending on how they react.
It changes the dynamics completely. Tony Stark as a cat can't physically do the things he normally does as a human. So, it forces other characters to step up in different ways. For instance, Rhodey might have to take on more of the technological leadership in the group. Also, it can make the story more light - hearted as the Avengers deal with a cat - sized Tony Stark running around and getting into mischief.
The pox can either strain or mend their relationship in fanfic. If Jon gets the pox, Catelyn might be more distant, fearing contagion or using it as an excuse to keep away. But sometimes, it can also make her realize his vulnerability and humanize him more in her eyes.
In fanfic, the relationship between Tony Stark and Jarvis is often a deep and complex one. Jarvis serves as Tony's loyal assistant, not just in a technological sense but also as a form of moral support. He anticipates Tony's needs, whether it's in the heat of battle or during Tony's daily tinkering in the lab.
In the fanfiction, Steve leaving Tony for Bucky could also make Tony more guarded in future relationships. He might be less likely to trust people easily, especially those who were close to Steve. And Steve, on the other hand, might be focused on building his relationship with Bucky, leaving little room for any kind of reconciliation with Tony.
In some fanfictions, the relationship between Tony Stark and Thanos is explored through their interactions with other characters. For example, if Pepper Potts gets involved in some way, it could change how Tony approaches Thanos. Or if Thanos' daughters play a role, it might soften Thanos' stance towards Tony, leading to a more nuanced exploration of their relationship.
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.
At first, it might be a bit rocky. Tony, being used to his own space, might feel smothered by Steve and Bucky's over - protectiveness. But as time goes on, he'll start to see their good intentions. Steve's moral compass will inspire Tony to be a better person, and Bucky's loyalty will make Tony feel secure. Eventually, they'll become like a real family, with Tony looking up to Steve as a father figure and seeing Bucky as a cool older brother.