In terms of Bangkok, the Groundskeeper, JC’s Bodyguards’, Exterminator and Waiter have all made an appearance.
I would so back Morgan’s bodyguard as the most useless, as he has little to no access anywhere, is detected by Morgan himself and isn’t even able to return to Morgan’s suite if exiting after the ‘On the House’ opportunity.
So I’d probably go:
Sapienza- Store Clerk
Marrakesh- Intern (screw that guy)
Bangkok- Morgan’s Bodyguard
Colorado- Militia Cook
Hokkaido- Patient (actually had my mind changed from Groundskeeper)