Roach
This NPC can be found in Dire Maul (32), Razorfen Downs (26), Desolace (21), Mana-Tombs (17), Western Plaguelands (16), Ahn'kahet: The Old Kingdom (15), Ruins of Ahn'Qiraj (13), Ahn'Qiraj (12), Sethekk Halls (10), The Culling of Stratholme (9), Grizzly Hills (8), Stonetalon Mountains (5), Azjol-Nerub (5), Icecrown Citadel (3) and Maraudon (1).