I love the mash up idea. But I still say, if you need a methodical, passionless, psychologically manipulative assassin in a modern game Orlen Johnson is your man. And, I'm not talking about his comic book version in Omar Shakti Must Die! either.
Was he the one who used a cultist as a meat shield slash shooting platform?
Yes. His other exploits included:
1) Wiping out an entire company of cultists with a Tommy Gun.
2) Negotiating a major arms deal with the Triad.
3) Planning to mercilessly torture another PC who had killed a mentally retarded kid in an earlier game session.
4) Sending all telegrams in Aklo and only communicating with Tom's character.
5) Leaving the pilot of a biplane to be eaten by a Hunting Horror after the Horror took down the plane.
There's more.