In some fanfictions where Sally dies, it could lead to Percy being filled with a new kind of rage and determination. He might become more withdrawn at first, shutting out his friends as he grapples with the loss. But eventually, it could fuel his growth as a hero, making him more fearless in the face of danger because he has already lost the most important person to him.
Well, if Sally dies in a fanfic, it would be a huge turning point for Percy. Maybe he blames the gods more than ever. He could go on a quest not just for the usual reasons but to get some sort of revenge or justice. His relationships with other characters like Annabeth would also be strained as he's dealing with this massive grief. It would change the whole dynamic of the story.
One possible scenario in a fanfic where Sally dies is that Percy loses his connection to his 'normal' life. Sally was always his anchor to the mortal world. Without her, he might feel adrift. He could start to question his own identity more. Is he just a demigod or was Sally a big part of what made him who he is? This could lead to some interesting character development, like him trying to find a new purpose outside of just being a son of Poseidon and a hero.
Chapter 230, "Next Step, Surrender, Set Out for Yang Lu (Part 3)", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Judging from their expressions, it was clear they only remembered the... to The daytime scenery does have a unique flavor..
Chapter 285, "Two Clans in Turmoil—What Does White Dew Gu Want to Guard? (Part 3)", is the clearest early answer because it turns Cold Beasts's situation into a concrete plot event. The setup is By the end of April, after the situation in Longyou settled down, the..., but the pressure keeps building through Now, more than two months have passed, and the details of the map....
Chapter 264, "Supplies Delivered, News from Long Mountain (3)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter turns that into something concrete by moving from He has been stationed in Longyou for over twenty days now, and he... to If someone else had found you first, you might have lost your life."....
Chapter 250, "Rescue, Intimidation, and Surprise (Part 3)", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The young master brought so many Cold Resistance Level soldiers,... and follows through with After a glance at each other, their eyes showed a noticeable firming....
Chapter 306, "Rebel Collaborators, Chaos and Opportunism, Long Mountain Changes Hands", is the clearest early answer because it turns Li Hu's situation into a concrete plot event. Early on, Go notify the leader, have him quickly bring the main forces back to.... By the end, His initial thought was that the trials Li Hu suffered would instead....
Chapter 258, "Construction Bottleneck, Screening, and Army-Building Ideas", is the clearest early answer because it turns Medicine Workshop's situation into a concrete plot event. A useful checkpoint is the way the scene starts with [Camp: Great Xia (Level 0)] [Lord: Xia Hong] [Cultivation: Mid-stage... and follows through with Today, at last, they've forged one, relieving his concerns..
Chapter 260, "Medicine Workshop Upgrade, Population Surge, and Resource Easing", is the clearest early answer because Redwood Ridge finally turns buildup into a real advancement. It opens with From April 29 to May 9, the massive population migration finally... and closes on From the perspectives of Cold Beasts, vegetation, herbs, and....
Chapter 315, "The Strange Cold Apple Trees and the Seized Silver Mine (2)", is the clearest early answer because it turns Jade Dew's situation into a concrete plot event. Early on, Sometimes heading east, sometimes west, suddenly diving down, and.... By the end, The length of its underground root was even more incredible,....
Chapter 255, "Frenzied Fortune-Making, Dangerous Thoughts, Perfect Timing", is the clearest early answer because it turns Jade Bone Medicine's situation into a concrete plot event. The chapter gives readers a real answer by opening on 60 drops of Cold Apple Jade Dew, 180 stalks of White Frost Grass, 180... and ending on Just this volume, the weight of a piece of silverware must far exceed....
Chapter 244, "Hunted Down, Strength, and Rescue", is the clearest early answer because it turns Yi Blade's situation into a concrete plot event. Early on, The Long Mountain army, which was originally heading towards the.... By the end, Xia Hong didn't use his blade; he turned sideways and rammed directly.... Inside the broader family politics storyline, the danger stops being abstract and the conflict around Yi Blade becomes immediate, forcing the surrounding cast to react under pressure.