(Yes i realise something similar has been written up before me, don't shoot the messenger). As far as i know only Peter Dinklage, Nathan Fillion and Bill Nighy have been recruited to lend their voices so far, but feel free to add any names who are rumoured or confirmed.
The Halo franchise utilized many talented voice actors. Bungie filled roles big and small with huge names like Ron Perlman, Keith David, Dee Bradley Baker, Nathan Fillion, Alan Tudyk, Adam Baldwin, Jen Taylor, John DiMaggio, Nolan North, Katee Sackhoff, Tricia Helfer, and even David Cross. With huge potential for a wide variety of characters, I eagerly anticipate finding out who else Bungie will recruit to voice Destiny...
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One can assume that Stacker is gonna lend a voice for something, too