Lucy would be extremely distraught. She and Natsu have a very close bond. She might cry for days and even isolate herself from the rest of the guild at first. Gray would be angry and feel a strong sense of loss. He'd probably blame himself for not being there to help. Erza would be stoic on the outside but inside, she'd be deeply affected. She'd take charge of the situation, making sure Natsu's death was not in vain and that the guild stays strong.
Happy would be inconsolable. Natsu was his best friend. He might stop eating fish, which was his favorite thing. He'd fly around aimlessly, calling out for Natsu. Makarov, the guild master, would feel a great sense of failure. He'd see Natsu as one of his own children. He might become more withdrawn and reflective, thinking about how he could have protected Natsu better. And the younger members of the guild like Romeo would look up to Natsu, and his death would be a huge blow to their morale. They might start to question if Fairy Tail can still be a place of hope and strength.
Well, the other characters' reactions would be complex. Levy might be in shock and start to research if there are any magical means to revive Natsu. She'd dig through all the books in the guild's library. Gajeel, who has come to respect Natsu over time, would be silently angry. He might take it upon himself to find the culprit if Natsu was killed. Cana would drown her sorrows in alcohol at first but then realize she needs to be stronger for the guild. Juvia would be sad not only for herself but also for Gray's pain. And the entire guild would likely come together in a big memorial for Natsu, sharing stories and memories of him, which would both be a way to grieve and to keep his spirit alive within the guild.
Chapter 474, "Handcrafted Wooden Bed", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event.
Chapter 464, "Is it Lingzhi?!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 352, "Furong Cake", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, Finding Liu Suqing's address was not an easy task.. By the end, It was filled with various flowers and plants, fragrant and....
Chapter 568, "Not at All", is the clearest early answer because it turns Gu Yu's situation into a concrete plot event. Early on, Shang Shaojing was silent for several seconds before he laughed as.... By the end, Let me introduce you, this is the young master of the Gu Family....
Chapter 362, "Just Donated Over Ten Million", is the clearest early answer because it turns Shu Yan's situation into a concrete plot event. It opens with Do you know what you're saying?" Jin Siyue was successfully amused to...
Chapter 360, "There's No Shame in Wearing a Dress Designed by Your Mother", is the clearest early answer because it turns Liu Suqing's situation into a concrete plot event.
Chapter 289, "After all, no one else has designs on Grandpa's inheritance but me", is the clearest early answer because Jiang Li gets a payoff that changes the stakes. A useful checkpoint is the way the scene starts with In the pure white room, a man lay motionless on the hospital bed,...
Chapter 488, "You Must Be the Captain Then!", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event. The chapter turns that into something concrete by moving from Lose face?" Nina's voice rose sharply, "We're already at a dead end,...
Chapter 299, "Only Got Second Place in the Whole Grade", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event.
Chapter 223, "Pigpen Live Stream", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. Early on, So, for the first time, Jiang Yan, who had always styled himself as.... By the end, The damned Jiang Li was tricking him again!.