The theme of identity is often explored. Sansa has to hold on to her Stark identity while being in the clutches of Ramsay. There's also the theme of manipulation. Ramsay is a master manipulator, and Sansa has to figure out how to not be manipulated. Additionally, the theme of female empowerment can be seen as Sansa finds ways to resist Ramsay and assert herself in a male - dominated and cruel world of the Bolton regime.
One common theme is survival. Sansa has to find ways to survive Ramsay's brutality. Another theme is power struggle. Ramsay has power over Sansa, and she tries to regain some sort of control. Also, there's the theme of redemption in some fanfictions where Ramsay might show a glimmer of humanity or Sansa finds a way to forgive, though this is less common given Ramsay's character.
Well, the theme of trauma is very prevalent. Sansa experiences a great deal of trauma at the hands of Ramsay, and many fanfictions explore how she copes with it. Revenge is also a theme. Sansa might seek revenge on Ramsay or those who allowed her to be in that situation. And the theme of hope is there too. Despite the dark situation, there is always hope for Sansa to escape or change her fate in these fanfictions.
Chapter 753, "Final Judgment", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. It opens with In the decade she had been with Fang Wenzhe, Shu Yan never thought... and closes on But Shu Yan was simply too outstanding..
Chapter 25 is the strongest chapter-level answer because it starts from Therefore, from his childhood, Jiang Shixu had felt an extreme aversion to... and follows through on Having worked beside Shen Lan for over a decade, she had been there when....
Chapter 695, "Is This a Matter of Money?!", is the clearest early answer because it turns Shang University Scholar's situation into a concrete plot event. The chapter gives readers a real answer by opening on Shang Shuyue just felt she was out of luck.
A practical answer is Chapter 5, because it turns the idea into a concrete scene. The chapter opens with Actually, when Manager Fang saw Jiang Li, he was somewhat surprised., adds pressure through How the hell did you get in?!, and ends on Recently, he did suspect that his wife was cheating on.
Chapter 750, "A Complete Beast!", is the clearest early answer because it turns Destiny's situation into a concrete plot event. The chapter gives readers a real answer by opening on Shu Yan glanced at Jiang Li with disbelief and then fell into deep...
Chapter 719, "Borrowing Their Luck", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Chang Rong: "Hmph, it has nothing to do with me anyway, since no one...
Chapter 730, "How Can You Make a Deal with a Madman?!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Xu Ning's emotions grew more intense as she spoke.
Chapter 614, "Storm Crisis", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. Early on, Today, the wind on the island was stronger, and for safety reasons,.... By the end, He slightly raised his head and met Pei Ye's dead eyes, his scalp....
Chapter 681, "She Actually Snatched It Away?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 830, "Pinky Promise for 100 Years", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event.