True agency in an isekai world is measured by the distance between a character's starting constraints and their final autonomy. Comparing a YPS-3 physical combatant to a YPS-2 authority-type strategist renders raw power scales irrelevant; one is built to shatter fortifications, while the other is built to govern the people inside them. The meaningful tension lies in how they acquire their status. Eris achieves her autonomy through a brutal, self-imposed exile, trading her noble identity for the calloused hands of a swordswoman. Her high Growth score reflects a refusal to be a supporting accessory, transforming her insecurity into a weapon. Shiroe, conversely, operates through systemic leverage. His power is not in the strike, but in the administrative labor of the Round Table. While Eris sheds her world to find herself, Shiroe builds a new world to escape his own isolation. This reveals a fundamental split in the genre: power as a means of personal liberation versus power as a tool for societal stability. Eris represents the triumph of the will over the body, while Shiroe represents the triumph of the mind over the system. One climbs a mountain to stand alone; the other builds a city to ensure no one has to.