Longstrike
Longstrike is a T'au tank pilot. His claim to fame is surviving an attack killed his friends, fighting a valiant retreat before some Razorsharks saved his blue butt. Not to be deterred, he decides to be one of the biggest mary sues ever and Headshot a 'WARHOUND TITAN'. Yeah, we're not making this up. After helping the T'au curbstomp the Imperium in the Taros campaign, he returns as a hero and is idolized by the T'au populace.
Meanwhile, the Earth Caste decided to build the XV02 pilot suit, which is supposed to give the wearer enhanced reaction time and better aim. Essentially, a six million dollar T'au. The catch? Only Longstrike can wear it without going brain dead or becoming a vegetable. Despite his major mary sue status, he is still a decent character to use in crunch.