(Phantom) Mizuki Shiranui

Taimanin, mother of Mizuki Yukikaze. Once renowned as a brave Taimanin, she temporarily retired from dangerous missions after Yukikaze's birth to work as Igawa Asagi's advisor. However, she was forced to return to the field after her husband was killed in action.

She uses a rare type of Water Art that controls the water to make clones and was called "Phantom Shiranui" back in her days. She says that her skills diminished since then, but she is still thought to match Asagi and according to her words, she can still wear her old Taimanin suit.