(occasionally, I'm going to throw in some of the older lesser known heroes)
Doctor Richard Occult is a fictional superhero appearing in American comic books published by DC Comics. Created by Superman's creators Jerry Siegel and Joe Shuster, Doctor Occult, also known as the Ghost Detective, is a private investigator and user of magic who specializes in cases involving the supernatural. Doctor Occult is the earliest character created by DC Comics still currently used in the DC Universe.
The character first appeared in New Fun Comics #6 in 1935 as one of the first depicted superheroes published by DC and in comic books in particular. He was depicted as a supernatural detective, whose detecting style was very much in the style of Sam Spade, only with supernatural abilities.
He also appeared in Centaur Publications' The Comics Magazine #1 under the name "Dr. Mystic". This was the same character because his story, "The Koth and the Seven", began in The Comics Magazine and continued in DC's More Fun Comics #14–17 (issues also designated as vol. 2, #2–5). In this story, he travels to a mystic realm where he flies and wears a cape, making him the first caped comic book superhero. This story also introduced the Seven, a group of mystics who would later be retconned into having raised Richard Occult and Rose Psychic. Doctor Occult made his last original appearance in More Fun Comics #32 in 1938.
He later appeared in Crisis on Infinite Earths (1986), The Books of Magic (1991), Vertigo Visions: Dr. Occult (June 1994), and The Trenchcoat Brigade (1999).