Proper Names

Q. I’m editing a translated interview transcription for publication by a university press. The sentence in question reads as follows: I asked, “Mr. agent, why don’t you do me a favor.” The speaker is addressing an unidentified agent of a Colombian paramilitary. The uncapitalized agent looks strange following the title of address, but then of course agent isn’t an actual capitalizable name. Should I go with “Mr. Agent,” or would “Mister Agent” take some of the formal edge off, or is “Mr. agent” preferable?

A. “Mister Agent” or “Mr. Agent” would both follow the customary capitalization. I agree that there is little precedent for “Mr. agent.”