They're effectively all single opportunities with no guarantees. Rex's Inventor was a 1X Tracker he'd have to give out to a target he didn't know was even town. Luna's Watcher is likely 1X, so basically just the most straightforward 1-shot investigative. For mine, I wasn't even guaranteed to pick a role that was in the game or validate it if I did. They're all very limited investigative roles, and all could have been manipulated by that Chauffer.
Noted, but we don't yet know all of Lunatic's abilities, and giving Batman's utility belt to two players seems heavy-handed, even if one of them did have to give his away blind