One of the most common characters is definitely her father, Ned Stark. Since Sansa has the chance to go back in time, she would likely interact with him a great deal to try and change the course of events. Another is Arya. They could team up and use their combined knowledge and skills to make a difference. And of course, Littlefinger. Sansa would be more aware of his manipulations this time around and might interact with him in a more strategic way to outwit him.
Well, her brother Jon Snow is often a character that interacts with Sansa in such fanfictions. They might work together to strengthen the North and protect their family. Cersei Lannister is also a common character in these stories. Sansa, with her new - found knowledge from the future, would interact with Cersei in a different way, perhaps trying to outmaneuver her politically. Additionally, Tyrion Lannister could be another character. Their relationship might be different as Sansa could use her knowledge to either befriend or avoid him depending on the situation.
Another theme is power. She may use her knowledge of the future to gain power or influence in the past. This could be political power, like influencing the decisions of the lords, or personal power, such as learning combat skills earlier. It's about how she can rewrite her own story with the advantage of hindsight.
In this type of fanfiction, a great plotline could be Sansa influencing the political landscape much earlier. She could use her knowledge of how certain houses would act in the future to her advantage. For example, she could form early alliances with houses that she knows will be important later. She might also try to change the way her family views certain people. Maybe she could convince her father to see Littlefinger's true nature much sooner. This would not only protect her family but also change the entire power dynamic in Westeros.
At first, their interaction would likely be very guarded. Sansa would be cautious as she has learned to be in a world full of danger. Tywin would probably see her as a young, naive girl but also a valuable asset. As time goes on, Sansa might start to challenge Tywin's ideas, which could lead to some intense exchanges between them.
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.
Theon Greyjoy can also be an interesting character to pair with Sansa. Their complex relationship can be developed further in fanfiction. Maybe Theon is trying to make amends for his past actions towards Sansa and they end up forming an unexpected alliance to face common enemies.
One idea could be that Sansa goes back in time and tries to prevent the Red Wedding. She could use her knowledge of the future to warn her family and change the course of that tragic event.
Definitely Hagrid. Hagrid has always been around Hogwarts and has a connection to the students. Sirius could interact with Hagrid if he goes back in time. Maybe Hagrid could help Sirius in some way, like providing shelter or information. And Bellatrix Lestrange could also be in the picture. Since she is part of the Black family, Sirius might have to deal with her in the past, either to try to change her or to stop her from doing something evil.
Kikyo can be a prominent character as well. Her connection to Inuyasha's past is deep. In a time - travel scenario, she could be alive in the time Inuyasha travels back to. This could create a lot of drama as Inuyasha has to deal with his feelings for both Kagome and Kikyo in this new situation, and Kikyo might have a different reaction to Inuyasha's presence since she doesn't know all the things that have happened in the future yet.
He might also interact with characters that are no longer alive in his present time. For example, an older werewolf or a witch who was powerful in the past. These interactions could provide Stiles with valuable knowledge or magic that he can use to his advantage when he returns to his own time. It could also create some really cool action scenes and moments of discovery as he uncovers secrets long forgotten.
Sansa, with her refined manners, would initially seem a bit out of place among the more casual Hogwarts students. However, Harry would see past that and recognize her strength. They could interact in a way that Sansa teaches Harry about diplomacy and strategy from her own experiences in Westeros. Harry, on the other hand, could introduce Sansa to the concept of magic as a tool for good. Their interactions would also be shaped by their shared experiences of facing difficult situations and having to make tough decisions. They might even compare notes on how to deal with enemies like the Death Eaters and the Lannisters.