 What do Miss Drayson and Kylen Braynek have in common?
Every man in the Diplomatic Corps who developed a twitch or a quirk was shipped to Saarkkad IV to work under Bertrand Malloy, Permanent Terran Ambassador to His Utter Munificence, the Occeq of Saarkkad. Number two suffered from some sort of emotional block that left him continually on the horns of one dilemma or another. No two men were alike, and yet there sometimes seemed to be an eternal sameness about all men. And he had his memories of Diane, dead these ten years, but still beautiful and alive in his recollections. Somewhere out there, the ships of Earth were ranged against the ships of the alien Karna in the most important war that Mankind had yet fought. To have shown himself to one of them would have meant instant loss of prestige. To violate the rigid social setup of Saarkkad would mean the instant closing off of the supply of biochemical products that the Saarkkadic laboratories produced from native plants and animals—products that were vitally necessary to Earth's war, and which could be duplicated nowhere else in the known universe. It was Bertrand Malloy's job to keep the production output high and to keep the materiel flowing towards Earth and her allies and outposts. A staff of top-grade men could have handled them without half trying. It's inefficient to waste a man on a job that he can do without half trying where there are more important jobs that will tax his full output. Not the worst ones, of course; there were places in the galaxy that were less important than Saarkkad to the war effort.
 They are both paranoid about what other people think.
 They externalize a lot of their thought processes.  They are constantly processing extreme amounts of details.  They both dislike interacting with other people.  They are both paranoid about what other people think.