Kon

is the heart or soul that all living beings possess. It works in conjunction with haku that allows a body to move. Unlike Haku, Kon, does not reside in the body and does not have its own physicality. When kon and haku are unified, it is called kokoro. Kon and haku are interactive and independent. When the body dies, the kon returns to heaven or ether. When Hakudōshi was creating various demon puppets using haku to animate them, the kon spirits of the demons were released after their initial deaths.