Neltharaku is the patriarch of NetherwingDragonflight, the faction of nether drakes of Outland. Like all nether drakes, he is a descendant of Deathwing, and possibly took his name from Deathwing's original identity, Neltharion. In the absence of Deathwing and forced to find a way to survive on their own in the shattered world, Neltharaku and his mate, Karynaku, guide the nether drakes into an uncertain future. However, Karynaku was captured by Zuluhed the Whacked and the Dragonmaw Clan in order to create dragonriders for service in the armies of Illidan Stormrage.
His name is possibly derived from Neltharion, father of the black dragonflight. Considering the fact that nether dragons are indeed mutated from black dragons, this is accurate, though nether dragons have no affiliation with the black dragonflight.