Extremely large and muscular, Chiropterans are fast and agile monsters. Most are capable of flight and are invincible to bullets and have the ability to regenerate entire limbs. However, they are vulnerable to Saya Otonashi's blood which is extremely toxic to them. However, Diva's blood is used to create Chiropterans. They are able to assume human forms, but when a food source is nearby, they reveal their true forms and feast on human blood. If a human is bitten or scratched by a Chropteran, they become one. Most Chiropterans are large, muscular monstrosities and can easily tear a human apart with their bare hands. Upon death, their entire body crystallizes and they become completely inert. They will shatter if struck after they crystallize.