Yamoto Koki

A troubled and traumatized schoolgirl that finds herself the victim of a Ninja Soul Posession Phenomenon by the Shi-Ninja, a Ninja Soul that grants her origami-themed powers, but results in the death of her parents. Over the course of the series she embarks on a quest of self-discovery and occasionally finds herself aiding Ninja Slayer.

She has a unique speech pattern due to Shi-Ninja's influence.