The Trilogy for the Batman Games was absolutely phenomenal, and after the events of Arkham City, every single person could not wait for the finale.When Batman Arkham Knight was announced, everyone grew ecstatic and cold not believe it was finally arriving, then it got delayed. Batman Arkham Knight was pushed back NINE long and difficult months. This delay only raised our expectations for what the game would provide, and once such thing was being able to free roam as all the characters we could play as in the game. These characters included, Robin, Nightwing, Catwoman, Azrael, Red Hood, and the amazing Harley Quinn. It should be done not only for the fans, but for yourself Rocksteady, your magnificent team has constructed your own image of Gotham from the ground up, and it deserves to be explored by villains and heroes. It may seem difficult at first to incorporate characters such as Harley, Azrael, or Red Hood into free roam, but these could be easily done as so. Red Hood could see Gotham and the realize that the mayhem he as caused as the Arkham Knight needs to be cleansed by him, and so we free roam as him simply beating up and killing thugs. For Azrael, he sees himself as Batman's new successor and therefore attempts to replace him by becoming Gotham's new savoir and attacks thugs arresting them. Finally Harley Quinn, she was put into her own specialized jail cell in Pannea Studios, so her leaving would not alert the GCPD, and no one would know unless they stopped by their. For the rest of Batman's allies, their story would be to finish was Batman trained them to do, so Robin helps clean the streets, and Nightwing stays because Bludhaven does not need him as much as Gotham does that night. For switching into them, Batman can switch into Azrael, Nightwing, Robin, Catwoman, or Red Hood. Robin can switch into Catwoman and Nightwing and vice versa, but only Batman can switch to Azrael and Red Hood, where Azrael and Red Hood can only switch into Batman. Finally only Catwoman can switch to Harley Quinn, she stops by Pannea studios and let's Harley have fun for just this night. Now the major issue would be traveling around Gotham, Batman, Robin, Nightwing, and Azrael could all drive the Batmobile, and each could say something like,

Robin: "I finally get to drive the Batmobile, thanks Bruce"

Nightwing: "See I miss all your gadgets Bruce, and I could never afford a tank"

Azrael: "I will not put your title to shame Batman, I will care for this vehicle as I do for Gotham" 

Now Red Hood could drive the Batmobile, but he could also have his own tank, although that may be too much to incorporate into the game , so he could say something like

Red Hood: 'I promise I won't destroy this one"

For Catwoman and Harley Quinn, again if incorprating various vehicals in the game is too much to ask, then they simply do not need to "drive the Batmobile" but instead hit the buttons required to have the Batmobile come to them, and you have Batman put them into the containment unit, then when you want to get out, Catwoman says: "Here's my stop Bruce, we should do it again sometime" and for Harley, Batman would pick her up and ask, "how did you get out?" where he'd put her in the containment unit and just throw her out where ever the player wanted to stop, and Batman would say, "It's your lucky day Quinn, I have more important matters, I'll be back for you"

Sign if you agree Rocksteady should allow every character the option to free roam, it is the final Rocksteady Batman game EVER, and do we won't get another Batman game in quite a while. Make this happen Rocksteady, it would make everyone happy.