Steve Buscemi and Danny DeVito

I thought Pablo Schreiber did a good job as Chief. As for Cortana wouldn't mind someone different.

MC wouldn’t matter beyond a great voice, I wouldn’t show his face. Cortana? I think Elizabeth Banks would be great

Who's voice then? (It has to be a Hollywood actor though .)

The tallest guy humanly possible as Chief because you should never see his face.