Anduin Wrynn !
Varok Saurfang ofc, no doubt.
I'd rather pick Illidan, but I guess from the current living characters I'd pick Thrall. Though recently, with all that Aggra pussy shit I'm tending more towards Varian.
I'm struggling to say Nathanos, since he was reduced to a low profile class trainer in Cata. Used to be such a bastard in a good way.