A sellsword in his early to mid thirties, Bronn is described as bone thin and bone hard, with black eyes, black hair, and a stubble of beard. Bronn is as mercenary as they come, caring only for his profits.
The actor cast in the role, Jerome Flynn, was born in 1963, making him approximately 10-15 years older than the character described in the series. His appearance is also not quite the same, but it is a minor detail.
Bronn accompanies Tyrion to King’s Landing, where he is placed in charge of the City Watch following Tyrion’s dismissal and exile of Janos Slynt. Bronn plays a key role in the defense of the city at the Battle of the Blackwater, setting alight the wildfire-laden ship that Tyrion uses to destroy part of Stannis’s fleet, and then saves the life of the Hound at one point with another well-placed arrow.