He is one of the seven monstrous children of Tau and Kerana, and as such is one of the central legendary figures in the region of Guaraní speaking cultures.
Kurupi's most distinctive feature, however, was a humongous penis that was ordinarily wound several times around his waist like a belt.
His penis is said to be prehensile, and owing to its length he is supposed to be able to extend it through doors, windows, or other openings in a home and impregnate a sleeping woman without even having to enter the house.
In some cases, Kurupi is blamed with the disappearance of young women, supposedly stealing them away to his home in the forest for use in satiating his libidinous desires (rape).
Rarely is he blamed with impregnating women anymore, although he is sometimes used to try and frighten young girls into being chaste.