Adrian.

Commander Adrian Mercer made commander at thirty-three — among the youngest in the service — and accepted the Pathfinder posting the day it was offered. The executive officer is the rank most of the 84,522 aboard will actually meet: the man who runs the day-to-day of humanity's first true deep-space mission, shift after shift, in a register so even that the ship has learned to read his silences instead. He uses fewer words than the job allows. The job has never once needed the extra ones.

Off shift, his quarters say what he doesn't. Heavy hardback books, brought aboard at his personal mass allowance and paid for without comment. Chess against the ship's game server in the evenings. Shostakovich, quietly, at the end of the long days. The formal Cape Town courtesy never quite switches off; colleagues stop noticing it about the same time they start relying on it.

Toward the cadets he is exact, institutional, and — if you watch the duty rosters closely enough — quietly protective in the small ways an XO is allowed to be. He would not call it warmth. The cadets, who are not stupid, have not yet decided what to call it either.