I'm gonna try casting Batman, but without the current choices already cast.
Liam McIntyre as Batman
Anthony Head as Alfred Pennyworth [He's basically playing Giles. But he'd have been so great.]
Lucas Till as Nightwing [All he needs is his hair dyed.]
Alexander Ludwig as Red Hood [His work in
The Hunger Games showed how great he can play up the violence of Jason Todd.]
Colin Ford as Red Robin [Well, considering he's a fan favorite for Dick Grayson, and I have Nightwing in my movie universe, why not have him play Tim Drake?]
Pierce Gagnon as Robin (Damien Wayne) [See
Looper.]
Jessica Stroup as Batgirl/Oracle [She basically plays the role on
The Following. Tell me the picture below doesn't scream Oracle.]
Phoebe Tonkin as Huntress [Refer to her work as Faye in
The Secret Circle. She can definitely play a brash vigilante like Huntress.]
Selina Lo as Batgirl (Cassandra Cain) [Trained in martial arts since 4 years old. And is young for the role.]
Olivia Holt as Batgirl (Stephanie Brown) [Young enough for the role, knows martial arts, is very funny.]