A love interest is also a common choice. In fanfictions, love can be a complicated and often treacherous thing. The love interest could have their own motives, like being forced by an external power or having a hidden agenda that conflicts with Fem Robin's goals.
Or it could be a mentor - like figure. They might have betrayed Fem Robin in the belief that it was for a 'greater good' that she doesn't understand yet. This type of betrayal can be especially hard for her to deal with as she had trusted this person for guidance and wisdom.
If you want the clearest chapter reference, go to Chapter 2. Early on, On the top floor of the Financial Building, a gathering of dark clouds...; later, the chapter leans on How dare Jiang Li hang up his phone?.
Chapter 731, "Ye Chu Died", is the clearest early answer because it turns Aunt Xu's situation into a concrete plot event. It opens with Dean, can I really not do it? and closes on She'd been acting off these days.. The key payoff is that the chapter closes with "Why did you come to the sanatorium?
Chapter 33 is the strongest chapter-level answer because it starts from Following the announcement, five artists respectively reposted the Weibo—... and follows through on Although Su Yinwan was considered half a goddess to him, the whole thing....
Chapter 878, "Do You Dare?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The setup is Su Yinwan not only chose a remote location for the meeting, but the..., but the pressure keeps building through The meeting was set for eight in the evening..
Chapter 788, "Don’t be so fierce, I'm scared", is the clearest early answer because it turns Lu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Song Xue covered her mouth in shock. to I really did not push the auntie that day;
Chapter 706, "How Did a Good Person Turn Out Like This?", is the clearest early answer because it turns Brother Shaojing's situation into a concrete plot event. The chapter turns that into something concrete by moving from Inside the building, President Sun and his group watched Zhao Lang...
Chapter 589, "Green Tea! Green Tea! Damn Green Tea!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Thinking of this, Zhao Lang gave a slight smile, "Alright, pedaling...
Chapter 767, "Jiang, Jiang Yu?!", 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 Then, Zhao Lang felt a different kind of gaze and turned his head,...
Look to Chapter 14 for the clearest answer. It begins with Lin Manru had a rare good night's sleep., keeps building through After freshening up, she specifically went to Jiang Yan's room on the..., and lands on But clearly, Lin Manru was unable to accept that her delicate daughter had....