Toyosatomimi no Miko is a hermit (specifically, a shikaisen, the lowest level of immortality a mortal can obtain) as well as an ancient politician and saint. She is also known as Prince Shoutoku. Mononobe no Futo and Soga no Tojiko have been her servants since she was alive. The word "mimi" means ear in Japanese, and as per her name, Miko has good ears. She is said to have been able to hear and understand the grumbles of each and every government official.

Miko is the cause of a past divine spirit incident. (However, she says that she did not have any bad intentions.) It began when she decided to become a hermit because she did not want to face death.

The Divine Spirit Mausoleum where Miko was buried was transported to the underground of Gensokyo. Byakuren did not know that Prince Shoutoku was buried inside and built Myouren Temple directly on top of the mausoleum to prevent Miko's resurrection, but this actually had the opposite effect and ended up helping Miko come back.

The incident caused by Hata no Kokoro was initially intended to garner people's faith. When Miko realized that the masks she had given to her servant in the past had turned into the tsukumogami Kokoro, she promised to make a new mask for Kokoro, which helped resolve the incident.

Despite the ups and downs in their relationship, Miko teamed up with Byakuren during the Perfect Possession Incident. On the other hand, Miko seems to be wary of the residents of Eientei.