Well, that can vary greatly. Some mangas might have their main characters die in dramatic ways for plot twists, while others keep them alive throughout. You'd need to be more specific about the manga you have in mind.
Not sure. It depends on which manga you're referring to. Different mangas have different storylines and character fates.
It's hard to say without knowing the specific manga. Many mangas keep the main character alive to drive the story forward, but there are some where unexpected deaths occur to add shock value or change the course of the narrative.
Chapter 488, "You Must Be the Captain Then!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on Lose face?" Nina's voice rose sharply, "We're already at a dead end,...
Chapter 377, "Master Above, Please Accept Your Disciple's Bow", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter gives readers a real answer by opening on Tell me what it is that you came to ask of me this time?" After...
Chapter 562, "So You Are Not First, But Last?!", is the clearest early answer because it turns Ai Xiaochun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with After they finished preparing the fish, Guo Xing and Luo Xuan got...
Chapter 907, "Disgusting Clothes", is the clearest early answer because it turns Disgusting Clothes Zhao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang originally thought this little kid was just casually saying...
Chapter 812, "You’re Extorting Money!", is the clearest early answer because it turns Jiang Mingchuan's situation into a concrete plot event.
Chapter 715, "Childhood Shadow", is the clearest early answer because it turns Childhood Shadow Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Mingyu let out a long sigh before collapsing onto the sofa,...
Chapter 584, "The Wealthy Young Master Renounces Worldly Life for Love", is the clearest early answer because it turns Life's situation into a concrete plot event. Early on, There wasn't a mirror on the small boat..
Chapter 452, "Party of Four", is the clearest early answer because it turns Party's situation into a concrete plot event.
Chapter 568, "Not at All", is the clearest early answer because it turns Crown Prince's situation into a concrete plot event.
Chapter 374, "From Now On, Jiang Li Calls the Shots in Golden Sand!", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li's bold behavior infuriated Jin Siyue, but it also succeeded...