Although Cuba is a kitsune with Konoha shinobi outfit complete with a forehead protector that he wore as a bandanna, flak jacket and regular shinobi sandals and red eyes, it possesses the upper-body structure of a human, complete with opposable thumbs on its clawed hands. He wears a Mask that the eyes can be revealed.
His first appearance was during the Loguetown Arc where he saved Monkey D. Dragon's son Monkey D. Luffy from Captain Smoker. At that moment a green gust of wind passed through Loguetown blowing Luffy, Smoker, Buggy, Alvida and their crew away. It's not known if he controlled the wind that blew off the marines at this point. Smoker would question Dragon's action, to which the Revolutionary replied about letting Luffy follow his path. Sometimes Later, The Kyuubi was sealed within Shinji Takato.