Suicide Squad. The Batman: Arkham series ended on a rather ambiguous beat, opening room for speculation as to whether this new Suicide Squad game will be a continuation of that universe or a timeline of its own.
[Warning: Spoilers for Batman: Arkham Knight below]
In most incarnations of the live action Suicide Squad movie from 2016. As one would expect from a super-group made of killers, thieves and terrorists, the Suicide Squad is kept on a short leash by way of miniature explosives implanted in their bodies. They're highly expendable, and are typically tasked with the government's dirty work.
the Suicide Squad game would come in. As an expendable, black ops military squad of high profile convicts, they certainly fulfill the criteria of a "darker hero." It's possible that Bats knew from the get-go that the government would have a fallback plan to keep Gotham on a tight leash if he ever vanished for good.
Suicide Squad Could Be A Perfect Continuation Of Rocksteady's Batman
The idea that the Suicide Squad could dispense justice without any of Batman's self-imposed limitations would fit perfectly in Rocksteady's universe. The Gotham depicted in the Batman: Arkham games is a fairly dark spin on the Batman formula, which is already no stranger to excessive brutality and vulgarity. This is especially true if the plot really does revolve around the squad setting their sights on taking out Superman (events of Injustice 2 proved, non-lethal means usually aren't a very permanent solution to a Kryptonian menace.
There's also the Justice League member in Rocksteady's universe, but Joker has been dead for a long time in Rocksteady's timeline, meaning that her character is perfectly primed to go good in this universe as well.
The Suicide Squad's other may not have a history of conversion like Harley does, but plenty of villains included in the Batman: Arkham games have had their time on the team before. Given that Rocksteady has worked with the likes of Deadshot, Deathstroke and Killer Croc in the past, it'd be no surprise if they turned up in a Suicide Squad game as well. Even then, Rocksteady does not need to limit themselves to characters who have been squad in the comics. They've proved themselves adept at handling many of DC's most popular baddies, and characters like Catwoman, Mr. Freeze and Victor Zsasz could all make wonderful playable inclusions in a Suicide Squad game.
