The four (playable) wingmen that come aboard the Lex with Seether are (according to the guide) Gambler, Scar, Steel, and Slash. It's probably easy to miss them, since you only get one chance to fly with them - the first mission in Silenos.
GAMBLER
ERIC FRIED
The most notable feature about Gambler is his mysterious lucky charm. For hours he will sit, staring at the stars outside the officers' lounge viewports, twirling what looks to be a coin betwen his fingers. When people approach, however, the object disappears, and he glares at the interlopers until they retreat. The second most notable thing about him is that even the other new pilots seem somewhat intimidated by him.
SCAR
MARTIN GALWAY
For a man who claims to be a pilot of long-standing, Scar has a certain hesitance about his assigned ship that either implies a certain lack of experience in the cockpit, or perhaps just an unfamiliarity with the types of ships flown by the Confederation. His knowledge about weaponry systems is excellent, however, as is his skill at hand-to-hand combat. He seems familiar with certain other people on board the ship, although he remains aloof to strangers.
STEEL
MARK BAIRD
He wants to do everything. He wants to blow the Border Worlders into dust. He learns fast and seems to have accelerated physical capabilities. No one knows where Steel was born, but he has definitely adopted the Lexington as his home. The Confederation is his only family — and sometimes even his superiors can't stand his enthusiasm.
SLASH
JEFF SHELTON
An excellent pilot, Slash is very rarely seen away from the ships info terminals when he is not flying a mission. Although the subjects that he accesses seem random, he has the air of a man driven by some unfulfilled need — as though he has to "catch up" somehow on the wealth of information that the ship can provide. Rumors circulate that he never even sleeps, but rests by just reading more slowly.