Glad to see the Batfamily getting some focus instead of just Batman himself.
Batgirl (Barbara Gordon), Nightwing (Dick Grayson, Robin I), Red Hood (Jason Todd, Robin II), Robin (seems like Tim Drake, Robin III) are the four playable characters so far.
I wonder if there will be more characters as DLC or for an inevitable sequel. Other Batfamily characters:
Robin V (Damian Wayne)
The Huntress (Helena Bertinelli or Helena Wayne)
Catwoman (Selina Kyle)
Batwoman (Kate Kane)
Black Bat/Orphan/Batgirl III (Cassandra Cain)
Spoiler/Robin IV/Batgirl II (Stephanie Brown)
Batwing (nobody likes Batwing)
Bluebird (Harper Row)
Batman II (Terry McGinnis)
Julia Pennyworth
Ace the Bat-Hound
Alfred Pennyworth (he was an elite soldier/spy in his youth)
Of that list, I'd most like Terry's Batman, Batwoman, Catwoman, and Ace