Agency in isekai correlates inversely with the stability of one's initial power set. While both occupy the YPS-3 tier, comparing their destructive ceilings is meaningless because they operate on different axes. Kazuma wields narrative power—the ability to exploit probability and game mechanics—whereas Shalltear possesses physical power, a suite of combat abilities hard-coded into her existence. This cross-type divide reveals a deeper truth about the DNA of these characters: raw capability is often a barrier to actual growth. Kazuma's low initial standing forces a trajectory of total adaptation, turning his status as a NEET into a foundation for pragmatic improvisation and emotional maturity. His growth is an active choice. Shalltear, conversely, is a static masterpiece. Her power is a cage, as her identity is a curated set of directives and fetishes designed by an absent god. Even her rebellion was a result of external mind control, and her subsequent atonement is a performative struggle to regain her place as a tool. Where Kazuma uses the world to define himself, Shalltear is defined by the world's expectations of her role. The narrative suggests that the cheat of innate power is actually a psychological anchor, stripping the character of the Ego necessary to drive their own story.