Deadshot
Floyd Lawton is Deadshot, a cold-blooded assassin who is an exceptionally talented marksman. Landing a headshot a.k.a direct hit with Deadshot almost guarantees a kill and charges Marksman mode which is his special move where time slows down making it easier to pull off direct hits. Each direct hit landed in Marksman mode adds more time to the special move timer. Use Deadshots assault rifle for range shooting and his wrist guns close up.
Harley Quinn
Dr Harleen Francis Quinzel is completely devoted to the Joker, totally oblivious to his psychotic nature and obvious lack of affection for her. Her primary weapon is a high damaging melee weapon in the shape of a baseball bat. Every time she strikes an enemy with it her combo meter goes up and each successive hit swings a tiny bit faster. Her special move is Frenzy mode in which time slows down similar to Deadshot's Marksman mode . In Frenzy mode you can move the crosshair over an enemy and it will trigger Harley to rapidly rush to the enemy and follow up with an overhead crush. This attack is effective against large groups of enemies.
El Diablo
El Diablo is Chato Santana, an ex-criminal with pyrokinetic powers whose primary and only weapon is to shoot fire out of his hands. For maximum damage with this pyrokinetic power he must be close to the target. The biggest advantage of playing El Diablo is that you do not have to worry about finding ammo although you do need to be aware of his pyrokinetic powers recharge rate.