Polpo is a minor character and antagonist featured in Vento Aureo.
Polpo is the first of Passione's capo Giorno Giovanna encounters and is responsible for recruiting new members. He then tasks Giorno to keep a lighter lit for 24 hours as a test. Polpo is a Stand User and his Black Sabbath automatically attacks Giorno during said test.
(Source: JJBA Wikia)