He was a human, adult character who appeared in the second period of the series, from 1983 to 1987. He interacted with human-size muppets Espinete and Don Pimpón.
Antonio was married to another human character, Matilde, and they had two children, Roberto and Ruth.
Although Matilde had a business of her own, the horchatería, Antonio apparently was not a business partner for his wife. He probably had an administrative job. In his free time, Antonio enjoyed playing the saxophone.