(Spoilers are just in case; I am aware that this isn't some ground breaking discovery but I honestly didn't know until yesterday.)
Kor'vas.
I really got a kick out of the realization. She is already my favorite demon huntress/Illidari just based on her personality, but now knowing that this wasn't some random night elf chick in that animated short was something I really dug. The whole Illidan smirking at her gave the whole video another dynamic.
I am shipping them together from now on. Try and stop me.