Well, since we have kistune... perhaps other yokai (or something along those lines) could work as well? I don't know any particular ones by name right now, but they're all spirits. X3
And warlocks...well...I actually have an idea for them.
They are born from the shadows of Human sorrow. Meaning that if a Human goes into a deep enough depression; their soul will begin to turn dark and a warlocks will begin to grow within them. Once the warlocks begins to grow the Human's demeanor will worsen, and after three months the warlock will take control of the Human's body. The main way to tell if an warlock has taken a body is the eyes. They will change to ranging from yellow-greens, silver-greens, and silver-blues depending on the power of the warlock. They can cast spells to create weapons.
I had another species that belonged with them, though they aren't necessary and I need to find them first. X3
