Exorcists

Exorcists are Angels that are sent from Heaven to kill a portion of Hell's population due to its overpopulation. They are the overarching antagonists in Hazbin Hotel. this is called cleansing on the tower in the beginning of the pilot.

Appearance
Exorcists appear to have a fairly uniform appearance each being black, white and grey humanoids with the only color being on their faces. They possess 2 large goat-like horns on their head above which sits a halo with a central gem and 3 smaller crystals on both sides. Along with 2 large wings on their backs likely allowing them flight, though this hasn't been shown. Their face is covered with something that looks like an LED mask capable of various expressions. Although we have only seen them smiling.

Exorcists appear to be mostly armed with spears similar in design to those of a harpoon. Illustrations of the Exorcists in the pilot also depict them with swords and possibly arrows but this has yet to be shown outside of the illustration. According to Vivziepop, they possess a variety of weapons such as guns, knives, swords, etc. Their special abilities enable them to possess any kind of weapon.

Personality
While little is known of the Exorcists, they appear cold and murderous. They are often depicted with a large grin, although their masks are capable of other expressions, as seen in the official trailer.

During an Extermination, they appear to mostly target those who are outside and it is unclear if they do enter some buildings. They do not seem to care much about their weapons and will often leave them in their victims, which are then gathered up by Hell's denizens and sold on the black market.

Trivia

 * According to Vivziepop, only The Exorcists can really and truly kill the citizens of Hell using their special tools.
 * When asked why there is a reason that The Exorcists and presumably other Angels are robotic, Vivziepop said that she can't say much, but she did confirm that they're not exactly robots. However, they do wear something that looks like LED screen masks on their faces.
 * The blades they use are very similar to the Angel Blade in Supernatural, in the fact that they both truly kill Demons.
 * Vaggie has one of the special tools, which is shown when she was pointing it at Alastor when he first came in the hotel.