The Kitsune Saiguu was a prominent historical figure in Inazuma who was worshipped as a kitsune goddess. During a "dark disaster," likely the cataclysm 500 years ago, she was among those who disappeared. She was consumed by a "dark will," and both her body and memories were broken down and turned into filth.

Although she does not formally appear in this questline, her voice appears in flashbacks. 

Minor role. Two appearances.

Speaks formally, sometimes coldly. I am imagining a voice similar to Yae Miko, but am open to other interpretations as well.