I'd say..
Spirit? Damn, she sucked every time I fly with her. Besides myself being the best pilot (maverick) for Super Wing Commander its Hunter or Iceman(depending what you fight). WingCommander 2, I have no idea. Never played. Wing Commander 3 would have to be Flash(I like him for some reason), Vagabond, Flint, or Cobra. Cobras cool all around, a little aggressive, Vagabond I always thought was cool. Damn good too. Flints tight against cap ships and Flash.. I dunno, he's tight against fighters I think. In Wing Commander 4 its definately Maniac. You barely ever fly with anyone else. I never played any other wc's
Ben