Role Call Superman played by Henry Cavill (6'1") I won't spend too much time on this one since Henry Cavill has already been cast as the last son of Krypton. I will say that from what we've seen of him in the Man of Steel trailer, he seems to have a grasp on what makes Superman special. He's a natural leader who inspires the confidence of almost everyone around him. He carries hope on his shoulders when there is no hope. Keeping Cavill in the role will help Justice League to make sequel-level profits by bringing in the audience from Man of Steel.
Batman played by Ryan Gosling (6'1") Christian Bale does not want to do another Batman film, and Joseph Gorden Levitt has already been cast as "Robin" in the Nolanverse. So who's left to take up the cape and cowl? Who better than Ryan Gosling. Widely recognized as a talented actor with the build for a superhero role, Gosling proved that he was suited to play the Dark Knight when he starred in Drive. In the lead role, he showed us his ability to embody Batman's coldness, gravitas, seriousness, and badassery. Batman may not always be the most popular person among his teammates, but he commands respect and loyalty. On film, Gosling could definitely do that too. Some people may be thrown by Ryan's blonde hair, but he does have the choice to darken it for the role.
Wonder Woman played by Gemma Arterton (5'7") Wonder Woman's nickname--the Amazon Princess--illustrates the beautiful dichotomy of her character. She's a powerful, strong-willed woman who would never back down from a fight or a challenge, but she's also a lover of peace who would never seek a fight or a conflict. She's simultaneously both the most fierce and most nurturing member of the team.With her powerful abilities and vast training, Diana is capable of going toe-to-toe with just about any hero or villain. Gemma Arterton's roles in Hansel and Gretel and Prince of Persia show that she has what it takes to make Wonder Woman work on screen. In Hansel and Gretel, she plays a tough, seasoned witch hunter who isn't afraid to headbutt her enemies at a moment's notice. In Prince of Persia, she not only showed that she can play regal well, she also did some badass stunts. Oh, and she has a pretty sexy British accent (the standard accent for foreign cultures and fantasy films in Hollywood), and she can do humor! She's pretty much perfect. She can look more or less Mediterranean with the right tan--as shown in Prince of Persia if that's a concern of yours. She's willing to shoot on location, she's inexpensive right now, and she has already proven that she can do swords and sandals types of movies.
Flash played by Charlie Hunnam (6'1") Barry is an everyman--a people’s superhero. Unlike many of the other heroes, the Flash is a hero that the public is likely to run into on the streets and interact regularly with, whereas some of his team mates stick to the shadows or fly. He’s approachable and passionate, spending his spare time working on police cases and visiting children in orphanages. These attributes make him indispensable to the team, as he provides a vital link between the Justice League and the people they serve. He's also very relate-able because he's been shy, he felt overwhelmed, and he's felt out of his league. But he's also determined, focused, and kind. His speed is unmatched by any member of the Justice League, and he can solve several problems before they grow into huge issues. He's got a strong science pedigree that lends itself to the Justice League and the Central City Police Force. His police training is useful because it helps to keep his team mates and himself from crossing the line.
Charlie Hunnam has Flash's looks. and he's enough of a rising star to carry Flash in a solo spin off film. He's proven that he has the right physicality in Pacific Rim, and he's done humor on Undeclared.
Green Lantern played by Chadwick Boseman (6'1") John is THE interstellar hero. He was chosen above all others for his courage, his willpower, and his honesty--three vital qualities in a Green Lantern. Like Captain America or James Bond, he's a no nonsense soldier who does what he has to so that he can get a job done. He can make the hard choices. And with John, it's not all about action. He's a great diplomat (as seen in Green Lantern: Mosaic). The Green Lantern Corps and the Justice League need bright lights like John Stewart now more than ever.
After breaking box office records with 42, Chadwick Boseman is the ideal candidate to take the John Stewart role. This is a guy to watch out for!