Gyakusatsu Koujo

She is the Head of the Miyagusuku clan, second only to the Kuchiki clan. Her family forges Zanpaktou and grows medicine for Shinigami that is only available in the grounds of the Miyagusuku. She is also Byakuya's original bride before Hisana. However, she went missing 50 years ago, and turns up 50 years later without an ounce of her memories. She is Gyakusatsu Koujo. Byakuyaxoc.