True utility in an isekai support role is measured by the distance between a character's starting point and their emotional destination. Because one operates through divine authority (YPS-3) and the other through physical combat (YPS-2), a direct power comparison is meaningless. Instead, the real divide lies in the direction of their trajectories: one is a descent into dysfunction, the other an ascent from trauma. Aqua possesses high raw power but zero ego, meaning she is a passenger in her own narrative, a divine tool that fails to function. Her low growth score reflects a character designed to remain static, serving as a comedic anchor that prevents the story from becoming a traditional power fantasy. In contrast, Rem defines herself through growth. Her narrative is an aggressive climb from a state of self-loathing and dependency on her sister toward a fragile self-determination. While Aqua’s bonds are superficial and based on shared misery, Rem’s bonds are heavy, born from a darkness that requires her to sacrifice her identity for Subaru. Aqua represents the absurdity of unearned status, whereas Rem embodies the agony of earned devotion. One is a goddess who acts like a child; the other is a servant who evolves into a pillar of strength. This contrast reveals that isekai handles non-physical power not as a tool for victory, but as a mechanism for character study—either as a punchline or as a catalyst for psychological reconstruction.