True agency in the isekai narrative is inversely proportional to predetermined power. While a YPS-5 rating suggests a level of dominance that should dictate the terms of a world, Mile represents the stagnation of the Apex archetype; her existence is a reaction to a cosmic error, rendering her growth trajectory flat. Her power is not a tool for self-determination but a constraint that forces her into a lifelong performance of mediocrity. In contrast, Beatrice operates at YPS-3, a scale where individual combat is strategically significant but not absolute. This gap in raw output is precisely where the comparison becomes interesting: Beatrice’s journey from a nihilistic librarian in a self-imposed purgatory to a proactive partner for Subaru demonstrates a psychological evolution that Mile cannot mirror. Beatrice earns her agency through the agony of abandonment and the risk of vulnerability, whereas Mile’s capabilities are an unasked-for gift that isolates her. The DNA profiles reveal a stark irony: the character with the lower power ceiling possesses a higher capacity for actual change. Beatrice’s struggle to find a contractor is a narrative of ascent, while Mile’s struggle to hide her abilities is a narrative of maintenance. When comparing a being who fights to be seen with one who fights to remain invisible, the value of the YPS scale shifts from a measure of destruction to a measure of narrative confinement.