Of all the Ayakashi Sisters, Koan was the most vain and ambitious.
Koan was the most conceited and most ambitious of the Spectre Sisters, as well as the most developed in the first anime. She was constantly making up her face, bemoaning her looks, teasing her elder sister Avery and shopping as a human for new cosmetics and clothes. Koan’s greatest dream was to become the Queen of crystal tokyo- with a King Rubeus by her side. Much of this fantasy was fueled by her belief that Rubeus loved her like she loved him, a fantasy which Rubeus did nothing to discourage.