A plot twist could be that Merlin is not who he seems. Maybe he has an ulterior motive for meeting Shirou, like using him as a pawn in a larger magical game. This would completely change the dynamic between them.
Perhaps Shirou discovers that he has a hidden connection to Merlin. It could be that they are related in some way through an ancient magical bloodline. This revelation would add a whole new layer to their relationship and the story as a whole. They would have to figure out what this connection means and how it affects their abilities and their fates. And it would also lead to a lot of self - discovery for Shirou as he tries to understand this new aspect of his identity.
One plot twist could be that Merlin actually loses his magic when he meets Shirou. This would force him to rely on Shirou's skills and ingenuity. Shirou, who is used to relying on his own strength and limited magic, would now have to take on the role of protector and guide for Merlin. It would be a complete role reversal and would lead to many interesting situations where they both have to adapt to their new circumstances.
Chapter 104, "The Camp's Strength, Rapid Enhancement (2-in-1 Mega Chapter)", is the clearest early answer because it turns Mu Dong's situation into a concrete plot event. The chapter gives readers a real answer by opening on As Xia Hong had predicted, ten days after Luo Yuan's breakthrough,... and ending on But the increasingly busy scene in the valley camp made Xia Hong feel....
Chapter 159, "Blood and Flesh Wall, The Leader Hasn't Broken Through Yet?", is the clearest early answer because it turns Teng Jiao's situation into a concrete plot event. The chapter turns that into something concrete by moving from The hundred-meter-thick wooden walls, arranged in a slanted cross... to In an instant, a dozen Cold Beasts were floundering at the wooden....
Chapter 66, "When one follows the way, one has many helpers; when one loses the way, help is scarce.", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with If asked, on this thrilling night of battle with the Wood Puppet... and follows through with Those who win support have many allies, while those who lose support....
Chapter 166, "Broken Defense of Mirror Immortal", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. Early on, They all held large blades, their faces expressionless, looking like.... By the end, Over a hundred people charging, Xia Hong calmly broke through the.... Inside the broader family politics storyline, the chapter closes with "Brother, the solidified fire oil can only suppress them, it seems not enough to kill them.
Chapter 176, "Resistance and Reason", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. It opens with In the Ice Abyss World, the weaker the human camp, the more they... and closes on He did not expect the other party to refuse him directly without even....
Chapter 206, "Pleas, Cold Element Festival, the Leader Emerges", is the clearest early answer because it turns Cold Beast's situation into a concrete plot event. Early on, Xiang Liang stepped into the silent hall, hearing only the echo of.... By the end, As Xia Chuan and the others approached to look, all five were....
Chapter 116, "Great Righteousness, Hunting Flood Dragons, Saliva [Five-in-One Mega Chapter]", is the clearest early answer because it turns Xia Chuan's situation into a concrete plot event. Early on, Their preparation was exceedingly thorough; they followed Xia Hong's.... By the end, Amidst dealing with so many attacks, Teng Jiao's sweeping strike....
Chapter 179, "Tigers Fall, Witnessing and Floral Heart [Happy New Year]", is the clearest early answer because it turns Qiu Peng's situation into a concrete plot event. The chapter gives readers a real answer by opening on It's so warm here!" "Why is everyone wearing animal skin clothing,... and ending on Especially the two in the lead, the one on the left had a fresh scar....
Chapter 157, "The Disappearance of the Cold Beast, Breakthrough Tide", is the clearest early answer because Xia Chuan finally turns buildup into a real advancement. A useful checkpoint is the way the scene starts with The Great Xia Station, second floor of the wooden house. and follows through with Listening to the conversation between Luo Yuan and Yuan Cheng, Shi....
Chapter 138, "Mirror Immortal Strange, Cold Resistance Level? [3-in-1]", is the clearest early answer because Deceitful Monster finally turns buildup into a real advancement. It opens with When we just merged, the temperaments of the brothers He Meng and He... and closes on When everyone in the camp truly accepts the Mirror Immortal, even....