Kiara Sessyoin (Fate/Grand Order)

Kiara Sessyoin (殺生院キアラ) is the therapist of the Seraphix branch of Chaldea Security Organization in Fate/Grand Order. She is later taken over by Demon God Zepar, taking on the personality of another self and ultimately transforms into Beast III/R.

Background
Kiara of the Fate/Grand Order world was brought up in the same circumstances as the Kiara of the Fate/Extra CCC until she was 14 years old, but her life developed differently from that point due to a doctor from outside the mountains curing her condition. She was no longer imprisoned in her bed, able to leave the mountains to have a happy life. Differing from the CCC her who went on to found a cult that perpetuated death, Kiara's "saintly nature" saved many people. This also caused her to be attacked by organizations who had vested interests in the fields in which she saved people. With complaints like, "Why are you outdoing us in our field, and for free at that!?", they made her out to be a villain, so she lost her place of belonging and later arrived at the Seraphix oil rig owned by Chaldea Security Organization.