The obsession with a singular ideal transforms destructive capacity from a tactical weapon into a curated personality trait. When placing a YPS-5 primordial entity alongside a YPS-3 explosion specialist, the gap in raw output becomes a distraction from the actual narrative symmetry. Both characters treat their ability to level landscapes not as a means to an end, but as an accessory to their identity. Diablo possesses the capacity to devastate continents, yet he finds fulfillment in the rigid constraints of a butler’s uniform and the meticulous management of Rimuru’s schedule. His power is a backdrop to his devotion, rendering his destructive ceiling a mere footnote to his administrative efficiency. Megumin mirrors this psychological profile through a different lens; she rejects the versatility of the magic system to pursue the "Path of Explosion," willingly accepting total incapacitation for a single moment of aesthetic perfection. Where Diablo suppresses his nature to serve a master, Megumin restricts her utility to serve an obsession. This comparison reveals that in high-fantasy settings, the restriction of power is often a more defining character statement than the accumulation of it. Their refusal to optimize—Diablo through servitude and Megumin through self-imposed limitation—shifts the story's focus from "what can they do" to "who do they choose to be." By treating world-altering capabilities as secondary to their idiosyncratic whims, they redefine the utility of power in the isekai framework.