Naruto is devastated. He feels a huge void in his heart. Jiraiya was the one who believed in him from the start, and his death makes Naruto question a lot of things. He might even start to doubt his own strength for a while.
We can get everyone's reaction after Fan Xian's death. According to the description in the second document, after Fan Xian was stabbed to death by Yan Bingyun, everyone's reactions were different. Wang Qinian's disappearance also shocked the Second Prince's personal guard, Xie Bi 'an. Fan Xian's grandmother, Fei Jie, Pingping, and father Fan also had different emotional reactions to Fan Xian's death. However, the search results did not provide any more information about the reactions of the others. Therefore, we cannot accurately answer everyone's reaction after Fan Xian's death.
We can get everyone's reaction after Fan Xian's death. The Qing Emperor lost his composure and sank into unacceptable grief. He even lost control and ran wildly, unable to stop. After Chen Pingping learned of Fan Xian's unfortunate death, he was furious and fell from his wheelchair, revealing the great shock and sorrow in his heart. As the elder brother, Fan Jian was heartbroken and could not bear the blow of losing his younger brother. After the news reached the Royal Palace, the Qing Emperor could not hide the panic and fear in his heart. He ordered Eunuch Hou to immediately investigate the truth. Chen Pingping loved Ye Qingmei deeply and treated Fan Xian as his own. After learning that he had passed away, he was filled with grief and sent people everywhere to search for Fan Xian's body. Fan Jian also rushed over to help. He was heartbroken by Fan Xian's death and scolded Chen Pingping for using Fan Xian as a chess piece. However, the search results did not provide any more information about the reactions of the others. Therefore, we cannot accurately answer everyone's reaction after Fan Xian's death.
In the second season of the year, after Chen Pingping's death, Fan Xian showed extreme grief and pain. He had been holding Chen Pingping's body, tears and rain mixing together. Fan Xian silently carried Chen Pingping down the execution platform as if no one else existed. His tears finally stopped flowing, but his body swayed, because the long journey and grief had exhausted him. Fan Xian was shocked and pained by Chen Pingping's death. He also expressed anger and determination and vowed to avenge Chen Pingping. His reaction showed his deep feelings for Chen Pingping and his respect for her.
Percy might be devastated. He could feel a deep sense of loss as Jason was a comrade. He might blame himself for not being able to prevent it, even if it wasn't really his fault. Percy has a strong sense of loyalty and friendship, and Jason's death would shatter his world in the fanfiction.
One possible storyline could be that Ace's death shatters the crew's morale, and Whitebeard, in his attempt to avenge Ace, faces an overwhelming enemy. In the fanfiction, Whitebeard might use his last bit of strength to protect the remaining crew members, leading to his own death. Maybe there could be a flashback of their relationship, how Ace was like a son to Whitebeard and how that bond drove Whitebeard to fight to the end.
Well, Ruby would probably be really enthusiastic about it. She's always open - minded and would likely find the creative ideas in the fanfic interesting. Weiss might be more critical, as she has high standards. Blake could be intrigued by different takes on the characters' backstories, and Yang would probably enjoy seeing some epic battles in the fanfic, but also might not like if her character is made to look weak.
Fanfiction writers often play with the idea of unfulfilled dreams or destinies. Ace and Sabo had so much more they could have done. So, in some fanfics, their memories are so strong that they exist as a sort of spiritual force. And this force is then able to influence events in a way that leads to their physical resurrection. For example, their memories might guide Luffy to a place where he can find the means to bring them back.
One possibility is that Amy would turn her grief into motivation. She could take on Sonic's role in protecting their world. She'd train harder, be more vigilant, and vow to defeat any threats that Sonic used to face. Her reaction could also involve her reaching out to Sonic's other friends, and together they could form a stronger bond in his memory, while also dealing with their own individual griefs.