Exorcists are Angels that work as Heaven's personal police force and military. Every year, they're sent to Hell in an event known as the Extermination to kill demons to manage Hell's overpopulation. They're exclusively female and follow their commander's orders to the very detail, as they are deadly loyal to whoever is assign as their leader. They are prideful of their kill counts, but they're simply like soldiers and as such, are human. Makes sense as many of them were once human before death.