Ahhh Barret. The man with the gun-arm. Barret has always been an example to me of taking a stereotype of a character and then giving him so much that he becomes his own.
Starting out as simply an angry black man who kinda looks like Mr.T, Barret he eventually becomes your right (gun) hand man. You learn that although he wants desperately to be a leader, he has so much self-doubt that he overcompensates by rushing headlong into things.
And in the end, his motivation is to make the world a better place for his daughter, the child of a friend he feels guilty for losing.
So yeah, even though he's a foul-mouthed, guns blasting, walking tank of a man. He's still, at the end of the day, a man.