Well, often there's the theme of struggle. Rey would be struggling against her oppressors, which could show her resilience. There might also be a theme of identity. Being enslaved might make her question who she really is and what she stands for. And sometimes, there could be a theme of forbidden love, where she might develop feelings for someone unexpected during her enslavement.
One common theme could be power dynamics. Since Rey is enslaved, it would explore how she deals with being in a position of powerlessness compared to her usually strong and independent self in the official Star Wars stories. Another could be redemption, either of those who enslave her or her own journey to regain her freedom and dignity.
Common themes in such fanfiction can include the exploration of the dark side of the Star Wars universe. Since Rey is enslaved, it might delve into the seedy underbelly of the galaxy far, far away. There could be themes related to resistance against the unjust system that enslaves her. Also, the psychological impact on Rey, such as how she copes with trauma and how it shapes her character going forward are likely to be explored.
Chapter 451, "Where Did This Madwoman Come From?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. It opens with Upon hearing this, the three people turned their heads in unison.
Chapter 579, "I Know Where Team Q Is!", is the clearest early answer because it turns Team's situation into a concrete plot event. The chapter turns that into something concrete by moving from Young Master, what do you think?" Having finished reading the... to Yet Jiang Li said, "Is that so?.
Chapter 364, "This is the gift our master sends you for the first meeting", is the clearest early answer because it turns Shariputras's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The final item is our heavyweight treasure for today." Even the host...
Chapter 242, "Jiang Yan's Dazzling Transformation Journey", is the clearest early answer because it pushes Dazzling Transformation Journey into a new phase or setting. It opens with Just when Jiang Yan called to heaven and earth in vain, he looked up...
Chapter 261, "They've Ruined the Entertainment Industry!", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. Early on, The village chief's eyes nearly popped out after he heard the whole.... By the end, Is it necessary to be so guarded against me?.
Chapter 568, "Not at All", is the clearest early answer because it turns All Shang Shaojing's situation into a concrete plot event.
Chapter 732, "Sister Xiao Wan, I Don't Understand", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter gives readers a real answer by opening on Bai Lu, eavesdropping in the corner, marveled at Jiang Cheng's...
Chapter 306, "I Believe Whatever Miss Jiang Says!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from But Jiang Li seriously shook her head, "No, Aunt Zhou, this matter...
Chapter 397, "Talent Show Program", is the clearest early answer because it turns Youth Trainee's situation into a concrete plot event. The chapter turns that into something concrete by moving from Second Aunt, I know you're worried about Shixu interacting with...
Chapter 600, "You merchants aren't even fit to carry my shoes!", is the clearest early answer because it turns Jin Siyue's situation into a concrete plot event. The chapter turns that into something concrete by moving from Shen Ruobing was not deaf to the ironic tone in Jin Siyue's comments,...