Concept Art
The titular character, Steven, is loosely based on Sugar's younger brother Steven Sugar, who is one of the series's background artists. Growing up, Sugar would collaborate with Steven and other friends to create comics. In an interview with The New York Times, she commented on developing the background of the show's protagonist, expressing her desire to base the character from the viewpoint of her brother growing up "where you're so comfortable in your life because you get all the attention, but you also want to rise up and not be the little brother."
Source: Wikipedia