Doom had the good idea of having a cast with distinct accents. I tried to follow that for the most part. McGregor would be great for the passive male lion who later become much more forceful.
Safa - L. Scott Caldwell
Rose from Lost as the voice of experience, which is what Safa needs. She would talk to Zill like she would talk to Jack.
Noor - Jennifer Connelly
I think Connelly has a voice that makes her sound bored but not boring. And she can be tough when she needs to be.
Ali. - Noah Gray-Cabey
Noah from Heros has the voice of youth and vigor that Ali needs.
Fajer - Djimon Hounsou
Powerful and demanding voice.
Crazy Monkey - Paul Giamatti
This is my favorite, this is based off his character in Shoot Em Up. I can see him yelling nonsense at the lions.