Miach leads the Miach Familia in Orario, renowned for his healing expertise and pharmaceutical operations at their headquarters, the Blue Pharmacy. Possessing long navy-blue hair, dark blue eyes, and refined features, he often unintentionally draws admiration due to his striking appearance. His personality radiates consistent compassion and selflessness, prioritizing others' well-being above financial stability. This principle drives his habitual distribution of free or low-cost potions, a practice directly contributing to his Familia's persistent poverty.

He maintains strong alliances with fellow deities Hestia and Takemikazuchi, frequently collaborating on city-wide issues or offering mutual support for their Familias. Miach financially aids Bell Cranel and the Hestia Familia by supplying them with free potions for their endeavors. His profound dedication to his members shines through his relationship with Naaza Erisuis, his sole initial companion. After Naaza lost her right arm to a monster, Miach incurred massive debt by borrowing from the rival Dian Cecht Familia to commission a prosthetic silver arm for her. This act bankrupted the Miach Familia, causing all members except Naaza to depart. Despite the resulting hardship, Miach never regretted his decision, valuing Naaza's safety far above wealth or status.

The Familia's fortunes see modest improvement when adventurers Daphne Lauros and Cassandra Ilion join following the dissolution of the Apollo Familia after a War Game loss. Their inclusion alleviates some financial strain through increased income generation. Miach's enduring rivalry with Dian Cecht manifests in conflicts like the dispute over a natural hot spring operated by Dian Cecht's Familia. Suspecting deception, Naaza investigates with Bell's aid, underscoring the ongoing tensions between the two healing-focused Familias.

During city-wide crises, such as the Guild-mandated closure of the Dungeon or the Faction War against the Freya Familia, Miach prioritizes collective aid over rivalries. He collaborates with Dian Cecht's Familia for large-scale healing efforts and participates in alliance strategies. In the Faction War, he utilizes a specialized deodorant created by Naaza to evade pursuers led by Allen Fromel. Though defeated in combat, his actions contribute to the alliance's broader victory.

Following the Ishtar Familia's collapse, Miach partners with Takemikazuchi to aid displaced residents in the entertainment district. They distribute rice wine and provide essential support, occasionally framing their efforts as playful activities to uplift the community. Miach remains defined by his unwavering altruism, manifested through healing, strategic alliances, and personal sacrifice for his Familia's welfare.