Ghosts look to be our sidekicks in this game. They are a reflection of our character that everyone can see, or a fun travel companion for those lone wolves out there.
Would you pay for DLC content that offered different skins for ghosts as well as ghosts with different personalities as done by different voice actors?
How about one voiced by Patrick Stewart or a funny one voiced by Louis CK?
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No the game already has a whole bunch of badass stuff it for the base $60. Why spend more on something for looks? And there won't be different voice actors. But I'll bet you the ghost will already be customizable/upgrades, showing everything else in the game does..