Gentleman Ghost, formerly known as "Gentleman" Jim Caddock was an enemy of Hawkman, Superman, and later Batman. He wore a white suit and pipe hat and used a variety of ghost-like weapons including twin pistols and a staff.
Justice League
Gentleman Ghost appears as a member of Gorilla Grodd's Secret Society of Super Villains. He appears being chased by the Green Lantern but is caught by a net.
Batman: the Brave and the Bold
Gentleman Ghost as he appears in Batman: The Brave and the Bold.
Before becoming a ghost, "Gentleman Jim" Caddock was a notorious highway man. He was later charged by the demon Astaroth to collect ten souls and return Astaroth to Earth. In the Underworld, Astaroth game Caddock his promised immortality but Batman and Etrigan soon defeated the demom. Caddock was sentenced to death but his ghost returned from the grave swearing revenge on the Dark Knight
During the Day of the Dead, Gentleman Ghost looted a city and was pursued by Batman and Plastic Man. He was eventually captured in a cemetary thanks to Batman's bronze nuckles and a net.
Gentleman Ghost attempted to raise an army of the dead using three artifacts. He even buried Batman at one point. However, with some help from Deadman, Speedy, and Green Arrow, Gentleman Ghost's army turned on him and dragged him to the underworld.