Ghost People

The  are the main enemies in the Fallout: New Vegas DLC Dead Money. They inhabit the area surrounding the Sierra Madre. There are many variations of Ghost People, such as Ghost Harvester, Ghost Trapper and Ghost Seeker.

Background
Protected by Hazmat suits, yet morphed into something no longer quite human, the Ghost People are the only ones to walk the Cloud. Anyone who isn't savagely killed when they first hear the insidious screaming the Ghost People make is dragged away to a fate that, while as of yet remains entirely uncertain, is probably much worse than dying in the streets.

They are very mysterious, they don't talk to their victims, they're evidently quite agile, highly territorial, and they have glowing green eyes. They don't die very easily - to really kill them you have to decapitate, dismember them or feed them to Dog.

There are a couple types of Ghost People, the Harvesters and the Seekers.

Interactions with the player character
All Ghost People are hostile to the PC. To kill them you must remember the Four D's: decapitate, dismember, Dog, or disintegrate, if you can. If Dog is your companion he will eat them when they are knocked unconscious. They usually carry a Knife Spear or a Bear trap fist The Ghost People are violent,as said in the collectors edition book (DLC section) and they wear hazmat suits of Russian origin and have turned into a nasty, unspeakable horrors inside of their suits, most likely due to large amounts of radiation, and the Cloud.

Appearances
appear in the Fallout: New Vegas add on Dead Money.