Well, as the title mentions Rorschach, he is surely a main character. There could be other characters who are part of his world. It could be his mentor, if he has one, or the villains he has been fighting against. Maybe there are also some characters from his past that play important roles in the story leading up to his death, like an old friend or a family member.
Since I don't know the exact details of this graphic novel, Rorschach is likely to be one of the main characters, given the title. There might also be characters who are related to him, like his allies or enemies.
Given that it's the 'Rorschach Death Graphic Novel', Rorschach is bound to be a central figure. In addition to him, there may be fellow vigilantes or anti - heroes who have interacted with him throughout his story. There could be a police officer or a journalist who has been following his actions and might be involved in the events leading to his death. And there could be a mysterious figure, perhaps a new antagonist, who is the main cause of his downfall in the story.
Chapter 159 is the strongest chapter-level answer because it starts from Seeing the red light of the camera turn on, Su Yinwan looked at the... and follows through on Shang Shaobai, who was browsing through files, received a call from his....
The best chapter pointer here is Chapter 166, "Daniu Gets Jealous!". It opens with Only after everyone in the small courtyard had left, did Zhao Lang stride... and closes on However, after interviewing the villagers, no one has gone missing, so we....
Look to Chapter 167 for the clearest answer. It begins with By the experimental field, Qi Tianyu was quite helpless as he watched Wen..., keeps building through He tried once again to pull back his suitcase, but to no avail, as one end..., and lands on Even when getting into the car, Qi Tianyu was.
The best chapter pointer here is Chapter 160, "The Mushroom-Picking Party of Six". It opens with As the sky gradually darkened, the originally mild drizzle began to... and closes on Then came Shu Yan and Jiang Li, while He Yun silently moved to the back of....
A practical answer is Chapter 164, because it turns the idea into a concrete scene. The chapter opens with Damn, the production team is so shady, they're still doing a live..., adds pressure through Let's congratulate Jiang Yan for getting— a one-point card!" Jiang Yan: ?, and ends on The current.
The best chapter pointer here is Chapter 216, "I'm the Director, I Call the Shots!". It opens with The production team also took advantage of the situation to start an... and closes on However, the next second, He Yun, who had hardly ever spoken to him,....
A practical answer is Chapter 130, because it turns the idea into a concrete scene. The chapter opens with This task, the first one, should have been his in the bag., adds pressure through Not to mention Wen Jiaojiao, who was still lying in the hospital on an IV..., and ends on Normally, the best.
The best chapter pointer here is Chapter 206, "Miss Su, Thank You So Much!". It opens with Five minutes later, Xingxing led Ah Fu out of the room by the hand. and closes on He was the oldest of several siblings and the most understanding of human....
The best chapter pointer here is Chapter 195, "Woke Up and the Base Was Stolen?!". It opens with Jiang Yan was fully equipped and followed at the end of the team. and closes on The audience and fans would definitely think she was dedicated and....
Look to Chapter 189 for the clearest answer. It begins with Seeing his painstakingly planted roses trashed like this, even as a fan of..., keeps building through Wenwen, I beg you, please take good care of my land!" "LOL, since when did..., and lands on Just after coming out of the bathroom, he.