Emperor is a classification of mechanical-type man-made shikigami.
'Model G1 Emperor'Edit
It's used in the story by Daizen Amami and Etou.
'Model G2 Emperor'Edit
It's used in the novel by Miyo Kurahashi.
It's used as Defensive Shikigami by powerful individuals.
The Onmyo Agency is protected by two models of the Emperor.