The characters for Yakumo literally mean "eight clouds", and Ran "indigo". All of the Yakumo family are named after colors. A nine-tailed fox yōkai whom Yukari Yakumo made her shikigami. She is considerably powerful even without her master's support; among other things, she uses this power to maintain her own shikigami, Chen. Since Yukari sleeps twelve hours a day, she handles the work during these times.