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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Wheatley, glados or Navi from Zelda. Although if it's Navi the only sounds she can have are "HEY! LISTEN! HEY! WATCH OUT! HEY! HEY! LISTEN!" Or perhaps a scyther just repeating random parts of his name and everyone just somehow understands it. Although if I could have two ghosts at the same time I'd have the space core and fact sphere from portal 2.