William King

William King made his DC Universe entrance in 1986's Who's Who: The Definitive Directory of the DC Universe — that landmark Copper Age reference work that codified the sprawling mythology of DC's heroes and villains — courtesy of writer Len Wein. With appearances stretching across nearly three decades and a presence in titles like Animal Man and Batman: The Brave and the Bold, King occupies a quietly intriguing corner of the DC cosmos, sharing pages with the likes of Green Lantern and a colorful cast of characters. A modest appearance count only adds to the mystique of a figure worth tracking down for dedicated DC completists.