Well, it could be about a misunderstanding. Maybe Percy accidentally uses his powers in a way that Thalia misinterprets as a threat to her leadership among the demigods. So she lashes out at him, and Percy, not one to back down easily, fights back.
In a 'percy and thalia fight fanfiction', it might be that there's some sort of outside influence. For example, a new and powerful magical item has been discovered. Percy thinks it should be kept safe in Camp Half - Blood, but Thalia believes it should be taken far away from there to avoid attracting more monsters. This fundamental difference in their beliefs could lead to a fight. Thalia might start the fight with her spear, while Percy uses Riptide. Their fight could draw the attention of other demigods, who are then forced to take sides or try to stop them.
One possible plot could be that there's a prophecy that involves both of them, but they interpret it differently. Percy thinks they should work together to fulfill it in one way, while Thalia has a completely different view. This clash of ideas could turn into a physical fight. As they fight, they start to realize that they're both being a bit stubborn and that they might need to find a middle ground to actually deal with the prophecy.
Chapter 210, "Hong Yu, Beehive, Observation", is the clearest early answer because it turns Hong Yu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zifeng returning to the nest." "Coming!" From beneath the boulder,... and follows through with Let's see how Luo Ming handles this!" Without showing emotion, Xia....
Chapter 159, "Blood and Flesh Wall, The Leader Hasn't Broken Through Yet?", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. It opens with Lin Wan, Shi Lu, gather all the children in the main hall on the... and closes on Luo Yuan, Yuan Cheng, Zhao Long, and the Earth-digging Realm who....
Chapter 238, "Decisive Victory, Admonition, Hou Tong's Plan (Part 3)", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. It opens with Hearing these words, everyone's expressions showed slight emotion. and closes on However, Xia Chuan's recent admonishment was clearly sincere, and the.... The key payoff is that the danger stops being abstract and the conflict around Xia Hong becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 217, "Hesitation, Departure, and Sending Word", is the clearest early answer because it pushes Long Mountain into a new phase or setting. The setup is Hive Station, Top Floor of the Main Building Above the spacious grand..., but the pressure keeps building through Chen Yingyuan landed in the hall and directly took the seat on the....
Chapter 255, "Frenzied Fortune-Making, Dangerous Thoughts, Perfect Timing (Part 2)", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. Early on, Hearing Xia Hong's words, Xia Chuan immediately nodded.. By the end, Our stock is sufficient, as long as they're willing to trade.... Inside the broader exploration storyline, the chapter closes with Li Xuandu and Hou Quan acted swiftly.
Chapter 214, "Meritorious Deed, A Fortunate Accident (Part 2)", is the clearest early answer because it turns Wang Hun's situation into a concrete plot event. It opens with Bring him over here!" "Hong Yu isn't here. and closes on In his nimble maneuvers, he not only dodged countless slashes but....
Chapter 232, "Rescue, Deception, and Xia City in Turmoil", is the clearest early answer because it pushes Li Xuantiang into a new phase or setting. Early on, From start to finish, his goal was not to kill, but to create an.... By the end, Having collided with a master of seven manes for the first time, his.... Inside the broader family politics storyline, the danger stops being abstract and the conflict around Li Xuantiang becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 188, "Venting, Drawing Lines, Preparations", is the clearest early answer because it turns Cold Beast's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Seeing that Yue Feng had realized his intention, Xia Hong was not... and follows through with Cold Resistance Level strength, quite the temper, previously clashed....
Chapter 267, "Stunned, the Astonishing Zhao Yuankong (Part 3)", is the clearest early answer because it turns Astonishing Zhao Yuankong's situation into a concrete plot event. The chapter turns that into something concrete by moving from Hahaha, you all are being too kind, this kid indeed has some clever... to Zhao Yuankong finally stopped having people ignite torches but first....
Chapter 173, "New Regulations of the Hunting Department, Building Upgrade", is the clearest early answer because Hong Guang finally turns buildup into a real advancement. The setup is Lord Chief, please continue, we understand." "Indeed, what's fifteen..., but the pressure keeps building through The leader used to lead seventeen of us, bringing back three....