Well, a lot of Maid Sama fanfics revolve around filling in the gaps in the original story. One popular theme is what would happen if there was a misunderstanding between Misaki and Usui that took a long time to resolve. This adds extra drama and tension to their relationship. There are also fanfics that might give a backstory to some of the minor characters in relation to the main couple.
If you want the clearest chapter reference, go to Chapter 1. Early on, Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or...; later, the chapter leans on Following a bout of tinnitus, she struggled to open her eyes and finally....
Chapter 743, "They Have Already Been Released", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. Early on, Too many people caused a commotion at Fang Family's place tonight,....
Chapter 868, "The Story of the Old Sea King Coming Ashore", is the clearest early answer because it turns Wealth Seal's situation into a concrete plot event. It opens with But despite Jiang Li saying so, the barrage in the livestream didn't... and closes on I came early;
Chapter 730, "How Can You Make a Deal with a Madman?!", is the clearest early answer because it turns Xu Ning's situation into a concrete plot event.
Chapter 933, "Gu Pansheng [Extra · Main Character Chapter]", is the clearest early answer because it turns Mom's situation into a concrete plot event. The chapter turns that into something concrete by moving from Even though Mom and Dad are often not at home, we have several aunts...
Chapter 37 is the strongest chapter-level answer because it starts from The barrage was suddenly filled with hahas, but the two guests present... and follows through on I look forward to your guidance." He Yun nodded slightly, then continued....
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 832, "So Impressive, My Sister!", is the clearest early answer because it turns Yu Fei's situation into a concrete plot event.
Chapter 833, "She’s Also a Quick Transmigrator?!", is the clearest early answer because it turns Sister Li's situation into a concrete plot event.
Chapter 910, "This place isn’t fun, I want to go home!", is the clearest early answer because it turns Jiang Buchen's situation into a concrete plot event. Early on, Jiang Bufan was not very shy.. By the end, It's all sister's fault for bringing us here..