True agency for a secondary character in isekai is measured not by destructive output, but by the direction of their psychological trajectory. Comparing a YPS-3 authority user to a YPS-5 physical combatant is fundamentally an exercise in futility because their power axes operate on different planes; one manipulates arcane laws while the other levels landscapes. Instead, the real friction lies in how they navigate their loyalty. Beatrice represents the struggle for emotional liberation from a centuries-old stasis. Her narrative is a fight against a paralyzing directive, where her growth is a hard-won victory over nihilism. Her power is a symptom of her grief, and her value is realized only when she accepts the vulnerability of a contract with Subaru. Conversely, Benimaru represents the triumph of institutional integration. He trades the volatility of a tribal prince for the discipline of a Minister of Defense. While Beatrice moves from isolation toward intimacy, Benimaru moves from individual vengeance toward collective stability. His utility to Rimuru is based on his ability to suppress his "battle maniac" impulses for the sake of the Jura-Tempest Federation. This reveals a core dichotomy in the genre: power is either a cage to be escaped, as it is for the librarian of the Forbidden Library, or a tool to be systematized, as it is for the Kijin general. The disparity in their Ego scores underscores this; one fights to find a will of her own, while the other finds fulfillment by aligning his will with a sovereign state.