The value of a supporting character in isekai is often measured by their utility, but these two reveal that utility is a choice rather than a stat. Megumin operates at YPS-3, capable of leveling cities, yet she intentionally collapses her own viability. By dedicating every skill point to Explosion, she converts raw power into a comedic liability. Her value is not found in the damage she deals, but in her refusal to be an optimized tool for Kazuma. Conversely, Visha operates at YPS-2, far below the destructive ceiling of a Crimson Demon. However, she achieves a higher operational stability. While Megumin becomes a burden after one spell, Visha becomes the structural foundation of Tanya's battalion through logistics and emotional labor. This is where the standard power scale breaks down. A YPS-3 asset is technically superior, but Visha's Darkness score reflects a willingness to endure systemic trauma that Megumin's whimsical world ignores. The contrast proves that in a narrative, the ability to maintain a baseline of functionality is more sustainable than the ability to trigger a singular, catastrophic event.