Bro Dude is a caucasian male, son of two self employed good-for-nothings. Physically, he's bald and has no beard, since having a beard would mean having a personality. He is a recently retired soldiers: his war-buddies still call him Sarge Bro. His choice weapons are pistols, which auto-reload every time it's needed.
If he has to fight in close quarters, his martial disciplines are Bad Manners and Bitch-Slaps.
Obviously, he has a Dead Relative (tm) and a troubled past, which caused him to only spit bad one liners and smoke the stinkiest cigars around. He proudly drives a Cool Car and has the emotional depht of a sheet of paper.
He can hardly ever resist showing you DEM PECS. When he was a child, he took a photo with the Invincible Hero of Heroes, thus becoming an Invincible Hero himself.
His last mission was a direct inspiration for the movie Commando. He always wears sunglasses, since his enemies would take advantage of him otherwise.
He's also an entrepeneur: he has recently synthetized a new energy drink, Bro Cola, from his own sweat.