Power in isekai often functions as a substitute for personality, but these two cases prove that the true metric of a character is how they resist or embrace their own capability. Because one operates via authority and the other via physical magic, the gap between YPS-5 and YPS-3 is a mathematical distraction. The real tension lies in the inverse relationship between destructive ceiling and human development. Mile exists as a cosmic accident; her YPS-5 status is a cage that forces her into a state of permanent self-effacement. By spending her narrative recalibrating her output to appear unremarkable and neutralizing existential threats in secret, she effectively deletes her own ego to maintain a facade. Her power is a static wall that prevents growth. Conversely, Roxy uses her YPS-3 capabilities as a bridge. Her struggle is not about suppressing a god-like nature but overcoming the insecurities of a petite outcast and the trauma of her childhood. Her trajectory from a lonely teacher to a maternal anchor proves that power is only meaningful when it serves the accumulation of bonds. While Mile's story is about the exhaustion of being everything and nothing simultaneously, Roxy's is about the courage to become someone specific. This comparison reveals that the genre uses "overpowered" protagonists to explore the nature of isolation, while "capable" characters are used to explore the mechanics of social integration.