Pombero’s original name in the Guaraní language is Karai Pyhare, literally “The man of the Night”, he is said to be a primarily nocturnal creature. In some parts of Argentina he is known primarily by the Spanish translation of his name, Señor de la noche.
Although accounts of the Pombero’s appearance and nature vary slightly from one community to the next, he is usually described as being short and ugly, with hairy hands and feet. His hairy feet are said to give him the abilat the Pombero generally dwells in rural areas, living in the forest, although he will sometimes choose to inhabit an abandoned house.
As a forest dweller, the Pombero is said to be able to imitate the sounds of various forest creatures. Most specifically it is believed that the Pombero can imitate birdsong, especially those of a nocturnal variety, and as such is viewed as something of a protector of the birds. Many witnesses of the Pombero say that before he appears he whistles. Most are so frightened of gathering his wrath that they never whistle again. One common aspect of the myth among various Guaraní based societies is that the Pombero protects the birds from children who hunt them with slingshots.
The Pombero is generally viewed as a harmless troublemaker. Owing to his preferred habitat of rural forests, the targets of his mischief tend to be rural farmers. Among his favourite activities are setting loose cattle, stealing eggs, chicken and honey, frightening horses and causing them to throw their riders off, as well as scattering corn, rice, or other provisions.