Green Arrow  

Green Arrow debuted in More Fun Comics 73, in November 1941, the product of Mort Weisinger and George Papp.  The vile canard that Green Arrow is a clone of Batman is often made by people who just aren't paying attention.  Weisinger actually patterned his twin creations, Vigilante and Green Arrow, after western melodramas, updating the  cowboy (Vigilante) and indian (Green Arrow) stories to an urban setting.  In both cases, the horses are replaced by modern motorized vehicles, Vigilante's cycle and the Arrowplane, which, despite it's name, couldn't fly.  Green Arrow almost could however, thanks to the catapult built into the front seat! More Fun 89- March 1943. Mort finally gave Green Arrow an origin and placed it firmly into American western lore, with tee pees, Indian tribes, lost mesas, gold mines and claim jumpers.  This was part of a long string of war time stories illustrated by Cliff Young and Steve Brodie.

In World's Finest 12 in January 1944, new writer Joe Samachson re-christened the Arrowplane as the Arrow-Car. Art by Cliff Young and Steve Brodie.  
Green Arrow's other wartime fill-in artist was the amazing Maurice Del Bourgo, seen here in the story from More Fun 101, January 1945.

Although Green Arrow's arch-foe, Bull's-Eye is sometimes touted as a rip-off of the Joker, there is really little resemblance.  Bull's-Eye is a former circus acrobat who wears a target on his costume and thus thematically matches Green Arrow a lot more closely than a playing card does a bat.
Bull's-Eye debuted in World's Finest 24 in September 1946.  This page is from World's Finest 35. Art by George Papp.
Green Arrow's arrow signal debuted in World's Finest 28, May 1947 in the same story that Police Chief Webber was named.  Unlike the Bat-Signal, which is a giant flash-light, the Arrow-Signal is a flare, similar to the one used by the early Fantastic Four. Art by George Papp.
1st appearance of the real airplane Arrowplane

Adventure 118 July 1947

Green Arrow's famous trick arrows were not part of his original schtick. The first to appear, the boomerang arrow, showed up in Adventure 108 in September 1946. Art by George Papp. The most famous, the boxing glove arrow arrived a few month's later in Adventure 118 in July, 1947.  Ed Herron introduced the Arrowplane in the same issue.  Batman's famed collection of specialty Batarangs appears to have been copied from Green Arrow rather than the other way around as they didn't appear until 1957. Art by George Papp. The infamous Arrow-Cave does not make its first appearance until 1952, in World's Finest 59 and does not appear again until 1956.  The rarely depicted "cave" appears to be a room in Green Arrow's basement up until 1960 in World's Finest 112. By this time, all of the Weisinger/Schiff heroes had secret caves of one sort or another.  This is part of a process by which heroes seem to start out unique and become more generic over time. Art by George Papp.