This character is a part of my personal setting called "Manacore". The world of Manacore is based on advanced occult technologies. At least it was. The Great war laid this world waste, leaving survivors to deal with the magical driven apocalypse.
This character is what they call a demon in this world. A demon is a spirit that somehow got a material form that differs from a human body. Otherwise, they call it possession. Bad things happen when the spirit that took material form is representing some sort of harmful idea.
But it is not the case for this character. She is not just a simple idea from noosphere, like many other spirits - she has a conscious. But it doesn't mean she is not dangerous. Actually, it means the opposite.