Demons are a form of life that exists in the Hellfire Dimension and in other realms of reality. But most are categoried by the fact that they are mostly supernatural beings that are somewhat manevolent in nature. They mostly view other forms of life the same way humans view the insects that they kill. Not all are bad, some are even on the side of good. Though even good demons cynical, or have some other personality trait that is considered somewhat tainted, including a sense of guilt or sorrow.