The true gap between these two YPS-3 practitioners is the distinction between power as an identity and power as a utility. While both possess the capacity to threaten a city, their DNA profiles reveal a fundamental disagreement on the purpose of magic. Megumin treats her destructive capability as a performance art, intentionally restricting her entire repertoire to a single spell. This refusal to optimize is not a lack of ambition but a rigid exercise of will; she accepts the status of a glass cannon because the aesthetic of the explosion is more valuable than the efficiency of the victory. Her growth is not an ascent in power but an integration of her obsession into a dysfunctional social circle. In contrast, Roxy utilizes her magical versatility as a tool for stability and connection. Her mastery of water and wind is a means to an end, serving as the bridge that allows her to transition from a marginalized outcast to a foundational pillar of a family. Where Megumin finds freedom in the limitation of her craft, Roxy finds liberation in the expansion of her emotional bonds. The comparison breaks down if viewed through a lens of combat efficiency, as the two operate on entirely different philosophical planes: one views the blast as the destination, while the other views the spell as the vehicle for a meaningful life.