Celica A. Mercury was Nine's younger sister, Jubei's sister-in-law, and Kokonoe's aunt. She had brown hair in her youth, and was naturally gifted in the use of healing magic. She was stubborn and unable to ignore those who are in need. She briefly traveled with Bloodedge during the Dark War, whilst trying to find information about her father, Shūichirō Ayatsuki. After the Dark War, she watched over the Black Beast's remains and built a church, waiting for a chance to reunite with Bloodedge. She later was the foster parent of Ragna, Jin and Saya, and was killed by Yuuki Terumi in 2192.