Agency in the isekai landscape inversely correlates with raw destructive capacity. While Kirito operates at a YPS-4 level, his narrative is an engine of self-determination, driven by a relentless need to reconcile his digital identity with his human morality. He forces the world to bend to his will, whether through the "Beater" label or his refusal to treat NPCs as mere code. In contrast, Milim exists at YPS-6, yet her agency is remarkably stunted. Despite her ability to reshape geography, she remains an emotional passenger, her trajectory dictated by the grief of her past and her reliance on Rimuru for social structure. The massive gap between Nation Level and Planet Level power renders a tactical comparison useless; instead, the data highlights a fundamental trade-off. Kirito owns his story because he is limited; Milim is owned by her status as a force of nature. Her lack of narrative protection further underscores that she is a static monument rather than a dynamic actor. This comparison proves that the more a character functions as a strategic deterrent, the less they actually control their own life.