Yumeko Hananokoji

Yumeko, often referred to as Mother, is a psychic counselor for ghosts who have not yet passed on. She helps ghosts adjust to their afterlives and, ideally, pass on. Yoshimori regularly supplies her with clients, as he prefers to deal with ghosts peacefully, rather than have to destroy them for staying close to Karasumori Academy.

(Source: Kekkaishi Wikia)