Perhaps she would try to change her own fate in terms of marriage. Instead of being betrothed to Joffrey, she could find a way to avoid that situation. She might look for a more suitable partner, someone who could be an ally to the Starks and not use her as a pawn. She could also use her knowledge of courtly intrigue to expose the true nature of those who were plotting against her family from the very start.
Well, one possibility is that she'd focus on her own personal growth. In the past, she was quite naive. But now, waking up with the knowledge of her past experiences, she could train herself in combat or politics. She could also seek out different allies, like perhaps reaching out to the Starks' old friends who were not as involved in the first time around. This would give her more power and protection in the dangerous world of Westeros.
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.
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.
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.
Well, one possibility is that Ash wakes up with all the powers of Mew. He could then use these powers to quickly become the best Pokémon trainer ever. He might be able to communicate telepathically with all Pokémon, understand their needs and desires instantly, and use his newfound psychic abilities to battle more effectively. For example, he could levitate his Pokémon during battles, giving them an unexpected advantage.
Arya might use her pregnancy as a form of strength. Instead of seeing it as a weakness, she could turn it into a motivation to create a better world for her child. She could start training a new generation of fighters, including her unborn child in her plans for a more just and peaceful Westeros.
The human might find themselves in a strange and mysterious underground world filled with unique creatures. Maybe they'll encounter a group of underground dwellers who have their own culture and language, and they'll have to figure out how to communicate and survive among them.
In this kind of fanfiction, Ash might wake up with new Pokemon - like abilities. For example, he could communicate with Pokemon in a more direct and profound way, like understanding their every thought and emotion just by looking at them. He might also find himself physically changed, perhaps having some physical features of a Pokemon, which could lead to all sorts of interesting adventures and interactions with his friends and other Pokemon trainers.
In the fanfiction, the person waking up as Lucy would have to face the challenges that Lucy herself has. This includes dealing with her past, like her relationship with her father. She would also have to manage her relationships with other guild members, such as Natsu and Erza. And of course, she'd need to keep up with her training to become stronger in magic. Maybe she'd even try to create new spells or improve on Lucy's existing 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.
Peter might face a lot of challenges. There would be people within the company who don't trust a young kid to run things. He would have to prove himself not only as a superhero but also as a capable business leader. He could start initiatives to use Stark Industries' tech for the betterment of the city, like improving security systems or developing new clean energy sources.
Well, Tony might get angry at first. He's used to being in control and having his orders followed. But then he could also realize that Peter has a point. Maybe they would have a big argument that leads to Peter leaving the team or Tony having to re - evaluate his plans.