Steely Dan is sadistic and arrogant, believing that his stand will prevent Jotaro from harming him and using it to exploit Jotaro in a multitude of ways. His arrogance shows when he pays a child to hit him with a broomstick, but when hit twice, he reacts angrily and punches the child. When his stand is defeated and he is left defenseless, Steely Dan cowers away and attempts to suck up to Jotaro instead, even offering to give him all the money that Dio Brando paid him for the job.

(Source: Jojo's Bizarre Encyclopedia)