The most popular pairing is definitely Ladybug and Chat Noir. Their dynamic as superhero partners, with the unspoken feelings between them, makes for a very appealing relationship in fanfiction. Another popular one is Marinette and Adrien. Since they are the civilian identities of Ladybug and Chat Noir, exploring their relationship outside of the superhero world is also quite interesting for fans.
Well, Ladybug and Chat Noir are the top. Their flirty banter and the mystery of whether they will ever get together is a big draw. But Marinette and Adrien also have a huge following. People love to write about Marinette's clumsy attempts to get closer to Adrien in her civilian life, and how Adrien slowly starts to notice her in a different way. There are also some who like to explore the reversed pairings like Chat Noir with Marinette and Ladybug with Adrien, but not as much as the main two pairings.
Ladybug and Chat Noir are the most popular by far. Their relationship is full of tension, from the times Chat Noir flirts with Ladybug to the moments when they have to rely on each other in battle. Marinette and Adrien are also really popular. Fans enjoy writing about Marinette's secret crush on Adrien and how she tries to hide it while still being herself. And they like to write about Adrien's obliviousness to Marinette's feelings at first and how it might change over time.
Chapter 108, "Without accumulating virtue through words, calamities of bloodshed will only increase, not decrease.", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 142, "From Enemy to Best Friend?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, The ingredients for making Buddha Jumps Over the Wall were still on....
Chapter 224, "Won't You Consider Introducing Me?", is the clearest early answer because it turns Sister Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li, ranked number one, was directly taken by the staff to an...
Chapter 208, "Those Who Commit Many Wrongs Will Destroy Themselves", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan clicked his tongue, "What's this about money?
Chapter 383, "Doomsday Beehive", is the clearest early answer because it turns Zheng Xun's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li's pale fingertips rubbed against the handle of the coffee...
Chapter 274, "Post-Traumatic Stress Syndrome", is the clearest early answer because it turns Lili's situation into a concrete plot event. It opens with Upon hearing this, Officer Xu became even more excited, but catching...
Chapter 222, "Oh, Miss Jiang Has Drawn It", is the clearest early answer because it turns Miss Jiang Has's situation into a concrete plot event.
Chapter 232, "He's a Pure Man! Purebred!", is the clearest early answer because it turns Zhou's situation into a concrete plot event. The chapter turns that into something concrete by moving from But soon, she suppressed this strange feeling and slowly began to...
Chapter 500, "Nearing Home Brings More Fear", 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 The room, white and gleaming, was filled with a faint smell of...
Chapter 312, "Charity Gala Invitation", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Du Sang's dinner party wasn't urgent, because it was still a month... and closes on Why the hell didn't they send me an invite?!.