wow redhead huh
Well yeah, gingers have no soul, just like death knights.
But actually, he was a redhead as a paladin, the magic of being raised as a death knight drained all the color from his hair.
His hair would normally be blue-white, but he found out in Northrend that mortals are slightly less unsettled by his appearance when his hair is colored (which made it a lot easier to give them orders.)
Luckily many blood elves are vain, (tev is too, in this respect) so it’s fairly easy for him to color his hair.