 Originally calling himself “K the Unknown,” he quickly changed his identity to that of the Black Owl.His original outfit was a tuxedo and an owl mask, but he soon switched to a blue and red costume.According to "Jess Nevins' Encyclopedia of Golden Age Superheroes", "His Rogues Gallery includes ordinary criminals, Axis agents, the Whistler, the femme fatale Madame Mystery, the murderous Reaper, Chief Skullface (a white man posing as a legendary Native American), the jolly evil prankster the Laughing Head, and the superhumanly strong and clever circus dwarf the Terrible Midge, who hates everything big."