Re: How would one use GURPS rules to make a campaign about possessig bodies?
"Balancing" the bodies available to possession is only an issue if not everyone has it. Anders' suggestion is a solid one.
Personally, I'd also add a DX score to each ghost, and either use that DX score, or an average of the ghost's and host's DX score for creatures, or use the full DX score for things like remote control cars. This lets some of the ghosts specialize in DX-oriented ways.
You'll want the "spiritual" limitation on possession.
For the "host's inhibitions", you could make the ghosts make a roll (possibly at a penalty) anytime they want to resist the given inhibition. Or you could assign them ad hoc on a host-by-host basis.
I'm sure you COULD set it up so that the ghosts have social traits. Why do they serve this organization? Surely they COULD have bank accounts and buy, say, bodies for them to posses, or have reputations within the organization.
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