Otome Rokudou

Rinne's mother who was known as a beautiful young genius, having earned a Platinum license (for having purified more than 10000 spirits) and a nickname “the Legendary Shinigami Maiden”. She disappeared when Sabato pawned her scythe and her newborn son was taking his first steps.

She was mentioned in chapter 313 when her scythe was found by Rinne, and sort of appeared in chapter 314.