High Quality Content by WIKIPEDIA articles! Guardian (James Jacob "Jim" Harper) is a comic book fictional character, a DC Comics superhero, created by Jack Kirby and Joe Simon. He first appeared in Star Spangled Comics #7 (April 1942). Guardian resembles an earlier Kirby and Simon character Captain America (first published in March 1941 by Marvel Comics) in that he had no super powers and carried an indestructible shield.