What is a half demon half human called?

Answer 1

Dhampire: A Dhampir is a being in Roma folklore that is half-vampire and half-human, born from a vampire father and a human mother. (In some beliefs the vampire father is the deceased husband of the widow mother) They are sometimes said to be able to kill vampires. Dhampirs are conflicted creatures, as they cannot turn from either of their bloodlines. They are outcasts among both humans and vampires, for they are neither. They also tend to have many health problems including bi-polar disorder, major depression, insanity, heat syndrome, photodermatosis, and anemia. During their teen years, many dhampirs also have urges of suicide, which can extend into their adulthood if they survive. Only in extremely rare cases will a dhampir be born and grow to adulthood: generally the female does not come to full term and the baby is lost; in other instances, the mother comes to term and gives birth to a stillborn. In some legends, a dhampir isn't the direct offspring of a male undead and female mortal, but the seventh male descendant of any line o mortals with a male ancestor who became cursed with vampirism. Other legends claim that a dhampir could only be conceived by a male vampire in the first night it rises as an undead, and again this is based on later legends rather than the original vampire as a spirit creature.

In Breaking Dawn by Stephenie Meyer, they just call it a halfbreed.

Answer 2

It matters the culture. In the West, such a being is called a Cambion; usually born of a Incubus mattering on interpretations. Merlin was reported to be one in myth.

Answer 3

vampire