He is a one-legged black man, who smokes a pipe and wears a magical red cap that enables him to disappear and reappear wherever he wishes (usually in the middle of a dirt devil).
Considered an annoying prankster in most parts of Brazil, and a potentially dangerous and malicious creature in others, he nevertheless grants wishes to anyone who manages to trap him or steal his magic cap.
He hides children's toys, sets farm animals loose, teases dogs—and curses chicken eggs, preventing them from hatching.
An exceedingly nimble fellow, the lack of his right leg does not prevent him from bareback-riding a horse, and sitting cross-legged while puffing on his pipe (a feat comparable to the Headless Mule's gushing fire from the nostrils).
However, depending on the treatment he gets from his master, an enslaved Saci who regains his freedom may become either a trustworthy guardian and friend, or a devious and terrible enemy.
claim that the Saci myth originated in Europe in the 13th century such as the monopod, it may derive from the Ŷaci-ŷaterê of Tupi-Guarani mythology, a magic one-legged child with bright red hair who would spell-bind people and break the forest's silence with his loud shouts and whistles.
The concepts of imprisoning a supernatural being in a bottle by a magically marked cork, and of forcing him to grant wishes in return of his liberty, have obvious parallels in the story of Aladdin from the Arabian Nights.
Moreover, the occupation of parts of the Portuguese territory (namely in the south) by the Muslim Moors, between the years 711 and 1249, provides another possible path for Arabian influence on the Saci legend.
[11] Since the Saci's one-legged physique reminds us of people with a physical disability, a social network named SACI (an acronym of Solidariedade, Apoio, Comunicação e Informação, meaning "Solidarity, Support, Communication, and Information") was created at the University of São Paulo with the purpose of stimulating these four efforts towards the social and medical rehabilitation of physically disabled people.