Soi  

Kaen Haku, 房宿

Soi is a Celestial Warrior named Kaen Haku who was rescued from a brothel as a child by Nakago. She possesses Feng Shui-related powers that allow her to control lightning and induce electromagnetic fields, as well as being skilled in Fhangzang and chi raising techniques. Despite growing up in a poor family, Soi was sold to a brothel and later rescued by Nakago when she was twelve years old. She fell deeply in love with him but knew that her feelings were unrequited, as he only used her to recover his chi. Nevertheless, Soi remains devoted to serving Nakago faithfully to the full extent of her abilities. In appearance, Soi is a formidable armored fighter who speaks like a man, concealing a kind heart and feminine nature. She has sympathy for Miaka Yuuki, particularly out of jealousy towards Yui, and even states that she envies their strength of love. Despite this, Soi does not desire to harm Miaka but will do anything for the sake of Nakago.