True narrative agency in isekai stems from limitation, not abundance. Comparing a YPS-3 physical glass cannon to a YPS-S authority figure is a categorical error; one operates within the laws of physics to break them, while the other exists as the law itself. Megumin's refusal to learn any spell other than Explosion is a radical act of self-determination. She trades versatility for a singular, destructive identity, turning her inability to fight a second time into a defining character trait. In contrast, Touya's ascension to a deity is a process of subtraction. By removing all friction and internal conflict, the narrative strips him of the very struggles that forge a personality. His YPS-S status renders him an administrator of a sandbox rather than a participant in a story. While Touya accumulates bonds and territory through the sheer gravity of his absolute authority, Megumin earns her place in a dysfunctional party through her stubborn adherence to an irrational dream. The DNA profiles reveal a stark truth: while Touya has effectively solved his world, Megumin is the only one actually living in hers.