Noise (Symphogear)

Noise are emotionless, mechanical, and only attack human. And the humans they attack get turned into carbon dust. There is no pattern to the time and place of their appearance and because they attack their environment without discrimination they are widely seen as a serious threat to mankind.

Noise are an alien race and are the main enemy of the Senki Zesshou Symphogear series. They are also created by humans, namely Sakurai Ryōko.