Demons take human form to rape or seduce human women. Half-demons are always human in appearance. Half-demons inherit the main power of their fathers. Elemental control, teleportation, telekinesis and telepathy are common, as are enhancements of regular human abilities, such as strength, sight and hearing. This power manifests itself sometime between the ages of twelve and twenty, though you may see precursors of it earlier than that, around ten.