The TV show "The Arrow" allowed a lot of building up the origin story, which really will be breezed over or highly condensed in a movie format. The show Gotham focused a bit too much on the villains, and I think the origin story of Bruce was highly rushed, even his training. Perhaps Matt Reeve's will do a better job with his Batman film, but it remains to be seen.
Green Arrow seems like a knock off of Robin Hood, but yes, also Bruce Wayne, in that he is a very wealthy guy who is also a vigilante. Even Batman's side-kick Robin, also a Robin Hood knock off. The comics industry and writers actually do this a lot. Even Captain America "Steve Rogers" was inspired by Buck Rogers -- interesting how Captain America's friend had the nickname "Bucky/Buck." I don't know much about Flash Gordon, but he was an extremely popular character, even George Lucas being a fan of him, and as I've heard was the inspiration behind the character The Flash.
That's been going on for a long time in comics starting with pulp magazines..and perhaps even before that. The Scarlet Pimpernel was an inspiration for such characters like Zorro...etc... which in turn was an inspiration for Batman/Bruce Wayne... and then the anime character Roger from Big O was inspired by Batman. People adopt what they like from other things.
The aristocratic wealthy guy that had a secret identity as a fighter was a popular trope, cliche, or overly used theme or device.
Zorro (Don Diego de la Vega), Jimmie Dale (The Grey Seal), The Shadow (Lamont Cranston), The Spider (Richard Wentworth), The Avenger (Richard Henry Benson), Domino Lady (an LA Socialite Ellen Patrick), The Phantom (Richard Curtis Van Loan), Night Hawk (Thurston Kyle) . . .
Before the Batman there was:
The Black Bat (Anthony Quinn), a crime-fighting former District Attorney. In his origin story, Quinn became the Black Bat after being blinded and disfigured by acid, when trying to save evidence against Oliver Snate in court. This idea was later taken for the character Two-Face.
An interesting bit of data..... the early comic book industry was mostly filled with Jewish guys, cartoonists, writers -- but their characters were based off of other characters that were already in existence. Even Jacob Kurtzberg (Jack Kirby) was into norse mythology. Jerry Siegel and Joe Shuster creators of Superman, basically created a knock-off version of Jesus.