Although the producer's of Arrow have gone to great lengths to honor the source material, somethings just have to be changed. Oliver Queen has been whipping arrows at the bad guys for almost 75 years now and that's a lot of information and history to fit into an hour long drama once a week. So, if you're a fan of Arrow and looking to make the jump to the comics then hopefully this list gives you an idea what you might (and might not) find.
TV Show: Actor David Ramsey’s character John Diggle was created for the show and has proven to be a fan favorite. The character was originally introduced as Oliver’s bodyguard and eventually went on to become an older brother figure of sorts and occasionally a member The Suicide Squad.
Comic: Oliver’s trusty bodyguard didn't exist in the comic. However, Green Arrow: Year One writer Andy Diggle’s last name was borrowed for the show as an homage to the creator. Diggle was introduced to the comics during Jeff Lemire and Andrea Sorrentino’s run.
TV Show: Felicity Smoak, as portrayed by Emily Bett Rickards, was first introduced as an IT rep at Queen Industries with whom Oliver would consult when he needed some help on the technical side of things. Eventually, she joined Ollie and Diggle in their war on crime in Starling City. She is the unrequited love of Oliver and usually breaks the tension with a self deprecating joke or two.
TV Show: Felicity Smoak, as portrayed by Emily Bett Rickards, was first introduced as an IT rep at Queen Industries with whom Oliver would consult when he needed some help on the technical side of things. Eventually, she joined Ollie and Diggle in their war on crime in Starling City. She is the unrequited love of Oliver and usually breaks the tension with a self deprecating joke or two.Comics: The name Felicity Smoak was actually used for a DC Comics character that appeared in Firestorm comics in 1984 and bears little resemblance to the character on Arrow. This fierce, dark-haired, version was the manager for a software firm and a constant foil to both Firestorm and his civilian identity of Ronnie Raymond. Recently, Arrow executive producer Andrew Kreisberg has introduced a version of Felicity to The New 52 that more resembles Emily Bett Rickards incarnation of the character to the Green Arrow comic.
Quentin Lance Was Gotham Beat Cop
TV Show: Captain/Detective/Sergeant/Officer Quentin Larry Lance, as played by Paul Blackthorne, is the father of Laurel and Sara Lance and the hot-tempered cop who usually has deal with the vigilante Arrow. Although originally out to stop the vigilante, he comes to trust the Arrow and will assist him in stopping the bad guys when he can.Comic: Larry Lance is still the father of Dinah Lance but does not have much of a role beyond that.
TV Show: Willa Holland's Thea Queen is the chronically troubled younger sister of Oliver Queen. Thea spent the majority of Oliver's disappearance and return partying and enjoying the social life of a spoiled heiress. Fall out from the first three seasons pushed Thea into the arms of her (recently discovered) father, Malcolm Merlyn, where he trained her in the ways of The League of Assassins.Comics: Thea Queen does not exist in the traditional Green Arrow comic books. However, the creators of Arrow have dropped several hints as to whom Thea might one day become. Oliver's nick name for his little sister is Speedy which alludes the comic book-verison of Green Arrow's sidekick. While training with Malcolm on Corto Maltese, she goes by the first name 'Mia' which could be a reference to Mia Deardon, who took on the Speedy mantle in the comics.