Utsuho Reiuji is the final Stage boss from Touhou 11: Subterranean Animism. Utsuho is one of Satori's pets, a Hell raven who has lived in the underground world since before it was separated from the Netherrealm. Her job is to regulate the flames of the Hell of Blazing Fires. Before the events of Subterranean Animism, she was told by a voice (presumably Kanako Yasaka's) that she could swallow the god, yatagarasu, that was hidden in the flames to gain a power that would fulfill the wishes of both the worlds below and above the surface. This power was nuclear fusion. Utsuho went mad with the abilities she had gained, and decided that, using these powers, she would take over Gensokyo. Her friend, Rin Kaenbyou, became worried about Utsuho, and drove evil spirits to the surface to cause an incident among the strong yōkai above ground, in hope that they would come down to do something about it and, when they got there, defeat Utsuho and bring her back to her former self. What came, however, was not a strong yōkai, but a strong human.
She is sometimes called ⑥ (an inverted ⑨) because she seems to have a simple and boastful personality, and is called a birdbrain by Orin. Also, she is often considered an idiot by fans. ZUN also indirectly calls her an idiot in her theme song's description. This leads to comparisons (or pairings) with Cirno.
On the GoAnimate RealmEdit
She and Cirno are Protected by Igor.