He has a big red nose with only a small amount of white hair.
He was dismissed by Lord Gaebril during the Gaebril's remaking of the army. Haslin was dismissed from his position training recruits allegedly due to his age but was really dismissed because of his loyalty to Morgase.
He was eventually recruited by Rand al'Thor to train the Asha'man in swordplay. He was briefly sent away by Mazrim Taim, who saw no value in weapons aside from the Power, until Rand commanded Taim to bring him back.