This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Cipitio (Salvadoran folklore)
Cipitio is a legendary character from Salvadoran folklore revolving around the Siguanaba and Cadejo legends. He is generally portrayed as an 8- to 10-year-old boy with a large conical hat and a pot belly. His name is taken from the Nahuatl word for child: "Cipit" or "Cipote". Some also relate his name to the deity Xipe Totec.
Esculture of El Cipitio, Meaning Boy.
According to the legend he is the product of a forbidden romance between Sihuehuet, goddess of the moon, and Lucero de la mañana. When Sihuehuet's husband found out about this affair he sought the assistance of the god Teotl, both the queen and Cipitio were cursed. Cipitio was condemned to live eternity as a small boy with his feet set in a backwards position, to serve as reminder of the twisted and illicit affair of his parents.