Seiko Ayase (綾あや瀬せ星せい子こ Ayase Seiko?) is one of the main characters of the manga series Dandadan.
She is a well-known spirit medium who also goes by the name Santa Dodoria (ドドリア三太 Dodoria Santa?) and is the grandmother of Momo Ayase. While performing her duties, Seiko provides support to Momo and her friends as they become involved with spirits, aliens, and other paranormal activities