Miach, a deity who descended to the lower world, leads a small, financially strained familia renowned for crafting healing potions. Struggling under the weight of competition from Dian Cecht—a rival god whose potent, mass-produced potions dominate the market—Miach clings to his gentle, selfless nature, valuing others’ welfare above profit. His lone loyal follower, Nahza, stands by him despite their familia’s precarious state.

When Bell Cranel begins regularly purchasing Miach’s potions, their bond deepens into mutual respect. Miach becomes a steadfast ally, offering guidance and aid during pivotal battles, his humility starkly contrasting Dian Cecht’s ruthless ambition. Their rivalry stems from clashing ideals: Dian Cecht pursues profit and power, while Miach champions genuine healing. This tension peaks when sabotage strikes Miach’s work, yet he refuses to retaliate with malice, instead honing his craft with integrity.

Haunted by the death of a former familia member—a tragedy born from forbidden healing magic—Miach bears lingering guilt that steers him from reckless methods. This pain fuels his resolve to protect others, even at great personal cost.

In later conflicts, he allies with gods like Takemikazuchi to oppose threats such as the Apollo familia’s aggression. During the Xenos crisis, Miach tends to wounded adventurers and allies, his moral clarity unwavering. Spin-off stories depict him supplying healing aid during emergencies and mentoring others in balancing compassion with pragmatism.

His appearance—marked by blue hair, traditional robes, and a crescent moon emblem—reflects his ties to healing and serenity. Across all portrayals, Miach embodies resilience, compassion, and an unyielding commitment to ethics, growing through adversity without compromising his principles.