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In the fictional Buffyverse established by ''Buffy the Vampire Slayer'' and ''Angel'', a Demon is a kind of nonhuman life form separate from the animal kingdom. The definition raises complex issues. Roughly speaking, the series uses ''demon'' to describe any creature that isn't a god, robot, unmodified human, or standard terrestrial animal. Thus, the category ==Origins== Many demon species are native to Earth. Many more had their origin in other dimensions. Long before mankind made its appearance, Earth was dominated by purebred demons, the most powerful of whom are known as Old Ones. Though individual Old Ones constantly made war with one another, rising and falling in power within the group, the overall dominance of the Old Ones was absolute. Over time, however, they gradually lost their hold on this reality. Some individuals, such as Illyria, were Though Earth was now under the rule of humanity, the Old Ones had left behind many descendants and former servitors. These demons, far smaller and less powerful than the Old Ones, were usually the product of crossbreeding with humans and other mortal animals. Many of these hybrid species retained some ability to crossbreed with humans and each other. Demonic reproduction is thus a diverse and complex subject. Some species, including vampires, Wraithers, and Werewolves, reproduce by infecting humans and then inhabiting and using their bodies. Others, such as Haxil Beasts and Skilosh demons, infect humans in order to use their bodies to gestate their young. Some demon species reproduce via sexual intercourse. Some indeterminate number of these species, for instance Brachen and Ano-Movic demons, are cross-fertile with humans. Some demon species reproduce via asexual methods, such as budding. Still other sorts appear to have been created or manufactured by some other entity (magician, Old One, Power), and do not reproduce on their own. Little is known about the origin and evolution of demon populations in other dimensions. Some dimensions appear to be home to large populations of entirely non-human demonic species. Others, such as Pylea, have significant indigenous human populations. Despite the obviously humanoid appearance of many demon species, some demon groups, most notably the Scourge, deny that they share any biological heritage with humans. This view may have more to do with ideology than biology, although they were unaffected by a machine designed to eliminate anyone with human blood. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Demon (Buffy the Vampire Slayer)」の詳細全文を読む スポンサード リンク
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