- Lord Commander Jeor Mormont, commander of the Night's Watch.
- Aemon, Castle Black's resident and ancient maester.
- Benjen Stark, First Ranger of the Night's Watch.
- Bowen Marsh, First Steward of the Night's Watch.
- Ser Alliser Thorne, in charge of training fresh recruits.
- Yoren, a recruiter for the Watch, rarely at Castle Black.
In the books
In the Song of Ice and Fire novels, Castle Black is located at the northern end of the Kingsroad, which runs for some two thousand miles all the way to King's Landing. Castle Black is ancient, although not the oldest castle on the Wall, an honor that lies with the long-abandoned Nightfort. Castle Black consists of a number of large structures, and in past centuries has held as many as 5,000 warriors. At the start of the books less than 600 soldiers are based there. Castle Black is defended by the Wall to the north, but is undefended to the east, west and south, to symbolize the Night's Watch being only a threat to the wildlings of the uttermost north, not the other realms of the Seven Kingdoms. Castle Black is only one of three castles permanently manned, the others being the Shadow Tower at the far western end of the Wall and Eastwatch-by-the-Sea at the far eastern end. Aside from these three castles there are sixteen other castles along the length of the Wall, all currently unmanned due to lack of manpower. Some of these have fallen into disrepair due to lack of use.
There is both a winch-driven lift and a switchback stairway that permit members of the Watch to reach the top of the Wall.
Behind the scenes
A significantly-sized castle set was built at Magheramorne, County Antrim, Northern Ireland, in a former quarry. The set includes several structures and a fully-working wooden lift system, although the Wall and much of the scenery will be added later with CGI.