- name: Haku Kaen
- birthplace: Western China, born to the Nei clan
- family: orphan
- age: 19
- birthday: October 30
- sign: Scorpio
- height: 5'7"
- bloodtype: O
- character: "bo" (tassel)
- location: upper left thigh (kinky...)
- abilities: Soi can manipulate lightening, wind and water. She calls her attack Hakujin Raiho. She can also perform the Bochuu (sex) spell. *^_^
- history: Because her parents were dead, Soi was taken care of by her uncle, but when she was twelve years old, the man sold her to a brothel. Soi wouldn't cooperate. She refused to take customers and the owner used to beat her and scream at her. One day, when the man was beating her, Nakago walked by with some soldiers. Seeing her and remembering how he himself had been treated, he rescued her from the man. When he found out she was a seishi, he brought her to the palace.
- seiyuu: Tanaka Atsuko
Soi is a strong woman and a competent soldier, but because she was never really properly raised and spent many years around soldiers, she isn't very ladylike. She is very blunt and her speach patterns are like those of a man. Nevertheless, Soi acts as a sort of mother to the other seishi, taking care of them when they need her...except Tomo. Tomo is a major rival of Soi as they are both competing for Nakago's love.
All of Soi's loyalty is for Nakago. She loves him deeply and feels indebted to him for saving her from the life of a prostitute.
