With regard to the Lannisters, she would be far more cautious. Instead of being charmed by Joffrey, she would see through his cruel nature immediately. And she might try to undermine Cersei's power in more subtle ways. As for Tyrion, she might still have some complex feelings, but she would be less resentful as she would understand that he was also a pawn in the Lannister games. In general, her relationships would be shaped by her newfound knowledge and determination to protect her family.
Her relationship with her father would be different. She would no longer be the naive girl he once knew. She could be more of an equal to him, advising him on political matters. For example, she could tell him not to trust Littlefinger as much. And with her sister Arya, she might be more open and understanding from the start, instead of having the initial rifts between them.
She might try to prevent all the tragedies that befell her family. For example, she could warn Ned Stark about the Lannisters' schemes, which might change the whole course of events in Westeros. Maybe she would also use her knowledge of future alliances and enmities to her advantage, forging new relationships and breaking old, harmful ones.
Tony Stark is a very intelligent and adaptable character. If he wakes up in the past in fanfiction, he would initially be confused but then quickly start to plan. He might use his charm and intelligence to get close to important people in that time period. He would also start making changes to Stark Industries' operations. He could introduce new safety protocols and start research on projects that were only possible in the future in his original timeline. He would be careful not to arouse too much suspicion while still making significant changes to improve things for the better.
He might try to change some events that led to bad consequences in his original timeline. For example, he could prevent the creation of some of his enemies or save the lives of people he lost. He would use his knowledge of future technology to give himself an advantage, like building better suits earlier.
His relationship with Hinata might be affected. She might be a bit more worried about him at first, but also see him as even more of a hero for having to endure this new transformation. With his friends like Shikamaru and Choji, they might be more cautious around him initially, but still be there to support him. They would have to get used to his new state and the potential danger it could bring.
In many Sansa Stark pregnant fanfictions, it can make her more resolute. For example, in some stories, she realizes she has to be strong not just for herself but for her unborn child. This newfound purpose gives her an extra layer of determination.
Sansa would be more assertive in her political moves. She has seen the consequences of inaction and bad decisions in the future. So, she would be quicker to make decisions that benefit her family and herself. For example, she might be more involved in military strategies to protect the North.
Well, her relationship with her dance partner would definitely change. If they were just friends or had a romantic relationship, the pregnancy would add a new layer of complexity. They might have to reevaluate their feelings and future plans.
The living situation could also create some new tensions. Clint might get annoyed with Thor's loud and boisterous behavior. But at the same time, they could also learn to understand and respect each other better. Maybe Clint would start to appreciate Thor's warrior spirit, and Thor would see Clint's skills in a new light. Natasha, being the observant one, would probably play a role in smoothing out any rough patches in the relationships among the team members.
The relationships would change in multiple ways. Rhaenyra would need to earn the trust of her siblings as their new guardian. There could be some jealousy or resentment from her siblings at first, especially if they were used to more freedom. However, as time passes, they would grow closer. Rhaenyra would also have to deal with any rivalries between her siblings. She would need to be fair and just in her treatment of them, which could either strengthen or strain their relationships depending on how well she manages it.
Bulma's relationship with the other Z - fighters would also be different. They would no longer see her as just the tech - support person. Now, she could be a front - line fighter. They might be in awe of her new powers at first, but then they would start to rely on her more in battles, and she would have to learn how to work with them in a more combat - oriented way.