It could be Iris. Since she's an important character in The Flash's story. The Flash might be forced to kidnap her for some strange reason, like to protect her from a threat that he can't explain to her directly.
It's possible that the victim is a new character introduced in the fanfiction. This character could have some unique ability or knowledge that the Flash believes is too dangerous to be left in the wrong hands, so he kidnaps them to keep it safe, which then sets off a chain of events in the story.
Chapter 736, "When Will You Come to My House for Dinner?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Walking outside the tent, Zhao Lang waved his hand.
Chapter 570, "A Simple Auto-Attack Baits Out an Ultimate from the Enemy", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on What the heck is that?" "?? and ending on It was impossible for Jiang Li not to know;
Chapter 808, "Dare to Spank Him?!", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. It opens with I don't listen, I don't listen," Jiang Bufan once again started his...
Chapter 678, "The Biggest Connection in the Circle of Friends!", is the clearest early answer because it turns Jiang's situation into a concrete plot event. Early on, The landlord stood up, maintaining his smile, "Fifty-eight thousand,....
Chapter 632, "The Last Supper", is the clearest early answer because it turns Brother Jiang Cheng's situation into a concrete plot event. Early on, Ah, Brother Jiang Cheng, no need for thanks, just stop standing at....
Chapter 905, "I Plan to Quit the Circle", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. The chapter turns that into something concrete by moving from The loud slogans echoed repeatedly across the expansive lawn.
Chapter 800, "So It Was Her Causing the Trouble!", is the clearest early answer because it turns Bu Fan's situation into a concrete plot event. The chapter gives readers a real answer by opening on You, young lady, how can you be so disrespectful and interrupt when...
Chapter 701, "Let Bai Lu and Chen'an Terminate the Contract", is the clearest early answer because it turns Chen's situation into a concrete plot event. Early on, Miss Jiang, that move of yours was totally awesome!" Shao Changqing....
Chapter 871, "Emergency Incident", is the clearest early answer because it turns Upon's situation into a concrete plot event. Early on, He really didn't expect such a coincidental event to happen to him.. By the end, I fell in love with my boyfriend at first sight too, we don't have....
Chapter 901, "Your Wonderful Future Has Just Begun", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. It opens with Actually, the Jiang Family had been very quiet these past two days,...