"In Batman v Superman, he was at the end of his rope. But in Justice League, he's finding hope again. He has to open up and play well with others. He knows he needs them."
That's what Ben Affleck had to say about a possible lighter tone for Batman
At one point during one of the Justice Leaguetrailers, Commissioner Gordon specifically says that it is good to see Batman working with other heroes again, and that seems to be the emotional and psychological throughline of the character in this film. Batman v Superman presented audiences with a hopeless version of The Dark Knight who not only felt threatened by the presence of metahumans on Earth, but also completely outmatched by their godlike powers. Now he sees the hope that they can inspire (particularly through his time working with Wonder Woman), and Justice League will follow his journey to become a team player (and team leader) in a way that he wasn't during his showdown with the Man of Steel.
Looking beyond the events of Justice Leagueand Ben Affleck's comments to Us Magazine, it seems highly likely that this arc will continue into other DCEU movies. We already know that a Batgirl movie is on the way under the direction of Joss Whedon, followed by a Nightwing movie directed by The LEGO Batman Movie director Chris McKay. With an entire Bat Family entering the silver screen DC universe, we may see a version of Batman who (unlike most silver screen Batmen that we have seen thus far) works better in a team environment as he grows. Remember, the Frank Miller take on Batman is only one version of the character; Justice League may have us someone more in-line with the work of writers like Scott Snyder or Tom King.
Credit Cinemablend for this article