Pesadelo was the henchmen of Cuca in the Sítio do Pica-pau Amarelo Series of 2008. He was created by the TV broadcaster, and was not a character of the book of Monteiro Lobato, and is not a character of the folklore of the Brazil.
His name means "Nightmare".
Pesadelo is ugly like his name. He have malformed theet and has a hump in his backwards. Like various henchmen of the current culture, is a jerk villain, and a bit hick.