I think the little sister is the central character. But there could be other important characters as well. Maybe her parents, who play a role in her life and in the family dynamic. There could also be her friends, classmates, or neighbors who interact with her and are part of the stories in the graphic novel.
The main character is Karen's little sister. However, depending on the plot, there could be other characters that are significant. For instance, if the story is about her school life, there might be a teacher or a bully that becomes an important part of the narrative. Or if it's about her hobbies, she might meet other enthusiasts who then become key characters in the graphic novel.
A practical answer is Chapter 16, because it turns the idea into a concrete scene. The chapter opens with Just as the words fell, Jiang Shixu swiftly cast his eyes downward., adds pressure through Smelling the pleasant jasmine scent coming from her, his tense nerves..., and ends on Jiang Shixu.
Look to Chapter 28 for the clearest answer. It begins with The next evening, Jiang Yan drove home seething with rage., keeps building through Before he even entered the dining room, he shouted angrily, "Lili, you did..., and lands on Lili then kicked his knee hard..
Look to Chapter 5 for the clearest answer. It begins with Actually, when Manager Fang saw Jiang Li, he was somewhat surprised., keeps building through Because she was really too beautiful, and very young, completely different..., and lands on Recently, he did suspect that his wife was cheating on.
Look to Chapter 52 for the clearest answer. It begins with The village chief and the woman behind him exchanged a glance, "This..., keeps building through might not be a good idea, you guys are still filming, we don't want to..., and lands on And at this point, they might as well try a desperate.
Look to Chapter 20 for the clearest answer. It begins with Several people turned their heads upon hearing the sound and saw three..., keeps building through She was clad in a long black dress, and the dull color did not hide her..., and lands on So, he turned and questioned Jiang Li..
A practical answer is Chapter 15, because it turns the idea into a concrete scene. The chapter opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,..., adds pressure through Jiang Shixu's mind was starting to cloud, but for some reason, when he..., and ends on Since.
Chapter 865, "His brother is your ex-boyfriend, right?", is the clearest early answer because it turns Chen Nanqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from I looked at your compatibility chart.
Chapter 27 is the strongest chapter-level answer because it starts from They had spent an entire year gradually inviting a few people. and follows through on Yes, I'm sorry." He nervously twisted his hands, "I was impulsive." "It's....