Halder

Halder is an unidentified background character in the first season. He is a newly made Builder of the Night's Watch, of the same group of recruits as Jon Snow.

Season 1
Halder is present during the speech Lord Commander Jeor Mormont gave to the "graduating" recruits. Dareon is assigned to the Builders.

In the books
In the Song of Ice and Fire novels, Halder is sixteen years old when he joins the Watch. Jon thinks him incredibly strong, but easy to anticipate. Halder had been an apprentice stonemason before coming to the Wall.