Shikigami

Shikigami (式神) are the spiritual familiars of the Exorcists.

Appearance
Shikigami come in a variety of forms, usually based on animals. They all have the Seiman inscribed somewhere on their bodies.

Powers and Abilities
Shikigami are created by Exorcists purely based on their imagination and spell power, as stated by Arimori Tsuchimikado that the specific characteristics of a Shikigami depends on what the exorcist in question sees a Shikigami as: a servant to serve, fight and protect them; a companion to assist and boost their powers or simply a literal tool to be easily disposed of and used at will by them.

This perception in turn determines the unique powers, abilities and qualities each Shikigami possess.