Suou Uzuki was the father of Shion and Jin Uzuki, and the husband to Aoi Uzuki. He died along with his wife 14 years prior to the beginning of the series proper. Shion blamed and resented her father for using her mother as a guinea pig test subject, making her "suffer subconsciously" for his research. Shion believed he abandoned her, and Luis Virgil claims Shion "hated" her father.