Steven is a hybrid between a normal human being and a "Gem", a fictional race of alien beings that exist as magical gemstones projecting bodies of light. Voiced by Zach Callison, he debuted in the series' pilot episode and made his main series debut in the first episode, "Gem Glow".
Steven Universe is a young boy with magical powers protected by his alien guardians, the Crystal Gems: Garnet, Amethyst, and Pearl. Steven himself is half-Gem and must come to terms with his identity as he grows up in Beach City with his human father, Greg, and human friend Connie.
Steven I. Leff is a Retina Specialist at Woolfson Eye Institute practicing in Atlanta, College Park, Cumming and Lawrenceville, GA.