Koo could no longer remember how long the reaper had held her life in his hands. She used her powers to strip demons of their souls, which she then gave over to the ever-covetous reaper. One day, she absent-mindedly asked him how long he would haunt her. "Until I find a more appetizing soul," came the reply as the inky blackness in his skull seemed to quiver.
Gu (also spelled "Ku" and "Koo") is a family name of the Chinese and Korean people. The most common family name Gù 顾 literally means "to care for". The family name Gŭ (谷, meaning "valley"), came about when a noble family of the Zhou Dynasty was rewarded a fief in a valley area. The descendants of the family adopted the name to link their lineage to that history.