Before the new look:
|Not so pretty but he doesn't mind it so much.|
In life, Nathanos Marris was trained by the high elves in the ways of war, and was admitted to the elven Farstriders. Nathanos' accomplishments were unprecedented. He was a tactical genius, responsible for Alliance victories spanning a decade of conflict. His heroics were not to last.
Source: http://wow.gamepedia.com/Nathanos_BlightcallerAfter the fall of Stratholme, the Scourge swept over the once-great nation. Despite his training, Nathanos Marris fell as well at his house, murdered by the abomination Ramstein the Gorger.Eventually, he became undead, and joined the Forsaken. Somehow, he knew that Sylvanas would come for him. Sylvanas appointed Nathanos as her champion - the Champion of the Banshee Queen. He even took a new name: Nathanos Blightcaller.
After a makeover:
|He still thinks we are imbeciles.|
Legion Spoilers! Be warned!The Banshee Queen's champion returns in World of Warcraft: Legion, issuing summons to the Horde champion on behalf of Sylvanas(the new Warchief of the Horde) and leading them to the Forsaken fleet approaching Stormheim. Predictably, Nathanos has retained his dry humor and low regard for most of the figures he crosses paths with (particularly the worgen, whom he writes off as "beasts"), save of course for Sylvanas. He is accompanied by his pet bat, Bloodwing.
When the Alliance led by Genn Greymane and Sky Admiral Rogers take the chance to bombard the Forsaken fleet, Nathanos makes his queen's safety his first priority, but is ordered to take the fleet on the offensive. He leads the Forsaken forces in a counterattack against the 7th Legion and worgen troops, flying from ship to deal with the Alliance soldiers. The Blightcaller and his men board the Skyfire and cause havoc in the hull, planting vials of blight to take it apart from within. Nathanos battles Greymane on the ship's deck, unimpressed with his opponent until goading Genn into assuming his worgen form. The battle ends with the destruction of the Skyfire, which plummets down into Stormheim, but both Nathanos and Greymane survive - although Nathanos' face is now apparently "even uglier" than it was before.
Nathanos takes command of the Forsaken stragglers, and leads his rangers in a ruthless hunt across the region to locate the missing Sylvanas. He is certain that the queen is alive and out there; and for their arrogance in striking the Banshee Queen, Nathanos goes out of his way to take bloody revenge on the Alliance forces remaining in the area. With the help of the champion, Nathanos is able to discover that Sylvanas safely escaped, but did not wish to be pursued. Her whereabouts remain unknown.
from All My Alts