The Demon Prince and antagonist who wants to use Miuko to fulfill his ambitions. He is possessed by a spirit with a vendetta against the Omaizi clan.

A magpie spirit who is a close friend and ally to Miuko. He has the ability to transform into different forms and aids her throughout her quest.

A snake demon who owns a gambling parlor. She assists Miuko and Geiki in exchange for a service.

A high-level cloud spirit who provides aid to Miuko and Geiki after they save them, on the condition of owing a favor.

A forest spirit with a distinct appearance who seeks justice but is easily swayed by flattery.

A young priest from the House of December who becomes friends with Miuko and assists her against the doro yagra.

A priest stationed in Nihaoi who initiates Miuko's expulsion due to a discovery that marks her as cursed.

Miuko's father and owner of their family inn. He cares for Miuko deeply but faces challenges in their relationship.

Two girls who initially summon Miuko as a demon but later become her allies. Each has their own personal conflicts that evolve throughout the story.