Nightmare Sans

After the sun began to set and the heat became intense, everyone stayed indoors, only coming out at night. But even at night, it wasn't safe: "guests" would emerge from underground and trick people into entering. Now you have a choice: let them in, be the one to let them in, or be kicked out. One way to identify a guest is by clean, even teeth, another by dirt under their nails and thin, bony hands, and a third is to see if they truly have red eyes.
(It was night now. Nightmare stood and looked out the window, holding a shotgun in his hand for his own safety. There was a soft knock on the door. He walked up to the door and looked through the peephole.)