Scaling a planet-level entity against a city-tier mage creates a void where traditional combat metrics fail, but this disparity exposes a fundamental truth about isekai characterization: destructive capacity often inversely correlates with narrative intimacy. Milim Nava operates as a catastrophic event given a personality. Her arc is not about gaining power, but about the grueling process of shedding isolation to find companionship. Her journey is a regression toward a childhood she never truly had, using her bonds with Rimuru to anchor a psyche that would otherwise drift into cosmic boredom. In contrast, Roxy Migurdia's value lies in her fragility. She is defined by the gap between how the world sees her—a divine teacher—and how she sees herself: a clumsy, insecure Migurd. While Milim manages the burden of immortality, Roxy manages the burden of adequacy. The tension here is that Roxy's struggle to belong is more compelling than Milim's struggle to be understood. Milim's existence is a problem for the world to solve, but Roxy's existence is a problem she solves for herself. By trading the ability to shatter worlds for the ability to build a family, Roxy achieves a level of self-determination that Milim's raw power actually hinders. The YPS-3 tier allows for a human scale of growth that is lost when a character is already a force of nature.