(Click his name to see a picture!
story is one that has left many believing that he's one of the hardest soldiers in the N7 program, second only to possibly Shepard himself.
His story starts when he and his Recon team were sent out so a system called the Kaelyn Traverse where they were checking on a platinum mining facility that had gone quiet. It turned out that the colony had been hit by Vorcha and Krogan who were former Blood Pack mercenaries turned full time pirates and slavers. He and his men were ambushed by a much larger force and eventually it was down to Coulter and a his best friend, a Gunny named Potts.
Coulter was captured while attempting to get to a comm relay that might have saved them. Potts tried to hold off the overwhelming forces but the Krogan and Vorcha quickly killed him and ripped Potts' guts out and threw them in Coulter's face. They made it a point to humiliate Coulter who was grievously injured from the battle.
Rather than killing Coulter outright, the Krogan decided to humiliate him further and asked how fast he could run. Coulter played up his injuries and as a result, the Krogan and Vorcha gave him a 200 meter head start. It was all he needed to leave them completely behind. All except one Vorcha who had actually managed to close some of the distance. Coulter hid and ambushed the Vorcha, killing him with his own weapon.
Coulter would then swim miles down a river, trying to get out of the Valley they were in and to the next comm station that lie on the other side of the mountains. The Krogan weren't stupid though and blocked the only pass through the mountains, waiting for the seriously injured and ill equipped soldier. Coulter did the only thing he could think of and skipped the pass and climbed the mountain, even staying a night on top of the mountain before coming back down. Then he started the eleven day hike through unfamiliar terrain to get the the comm station.
By the time he reached the comm station he was in really bad shape. He signaled for help from the Alliance fleet he was sent by and held his position against the attacks that came after that until relief arrived. When the marines found Coulter he had taken serious injuries to most of his left side, frost bite here and there, and was suffering from malnutrition and a variety of other issues. Coulter was given the Medal of Valor among others and was promoted to Commander.
He's been kicking ass and taking names ever since, using two cybernetic limbs (left arm and leg) as well as a custom suit of armor.