I think it would be cool if we could buy an exotic ghost that had a different voice actor and some other cool perk.
With the life exotic perk of course, like the faction class items.
Why is there no exotic ghost anyways? I know I want one.
Who would you want your ghost to be voiced by?
EDIT: Some cool ideas for perks so far:
Opinion Invalid: Ghost detects all planetary materials
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In addition to the GLaDOS and Tara Strong ones suggested elsewhere in the thread, I'd love a completely insane Ghost. Babbles nonsense for some of the 'Public Event' and 'Guardian Down' lines and is very obviously psychotic in the story lines. Or a total polar opposite to Nolanbot's chipperness; an entirely resigned, despondent Ghost that's just expecting everything to go wrong.