The mid-size goblins.
About as tall as a human they are wiry, intelligent and seriously aggressive. They are very much beings of a pack-mentality and work extremely well in groups. Their instinctive habit of identifying the drow-houses that own them as their Pack makes them almost fanatically loyal and highly valued slave-soldiers in some of the houses of the city.
Skin-colour are about the same as lesser goblins, but unlike the mostly hairless goblins, hobgoblins have dark hair, or in some cases a more reddish tone to it. For some reason almost all hobgoblins keep their hair short-cropped.
Although not as strong as an Orc the average hobgoblin is faster and equally resilient.
They hold all but their drow-masters in the deepest of contempt. The single sure way to get at hobgoblin rebellion is to have them do work that they consier beneath them. They are almost obsessively a warrior-race and anything that could be done by other races (latrine-duties, janitorial stuff etc) really should be. Some drow consider it unacceptable to let a slave-race have its own way and thus refuse to have hobgoblins as slave-soldiers. Others accept this as the price you pay for dedicated warriors.