Half Demon

Biology
Half Demons are the results of a pairing between a human father and demon mother, and their descendants. They are similar to their biological cousins, witches. In their first-generation, they closely resemble their demon mother with some human characteristics. The farther a half-demon is generation wise from their demon ancestor, the more human they appear, with modern half-demons with demonic ancestors dating back to before the Witch War, looking exactly like normal humans for many generations.

All half-demons possess inhuman characteristics naturally, be it oddly colored hair or eyes that are similar to their demon ancestor's own characteristics. It is common to find half-demons of the same family, to greatly resemble one another. After so many generations, a half demon's demon blood becomes so diluted with human blood, that they lose the ability to use magic and will age similar to normal humans. However exposer to demons or the demonic realm can have strange effects on a half demon's body, such as making their bodies age but their organs mature at a much slower rate, causing anomalies such as childbirth or the start of menstrual cycles in old age. A half-demon can awaken their demon blood, however, giving them the ability to use magic, survive in the demon realm and have a more natural life span (as half-demons normally age slower than humans, however after many generations, most half-demons age at the same rate as humans with some exceptions involved with those exposed to demons/the demonic realm). Unlike witches, half-demons do posses counter demons, which oddly seem more human than their half-demon counterparts with the exception of their cat-like eyes.