No they didn’t got void customisation.
And no, Alleria is a special case reserved for character. The void elf cant find a ton of corrupted naruu like her.
Racial leader aren’t always like playable character. Goblin dont have a fat model, undead dont have a elf model like Sylvanas or a light human model like Arthas sister. LF dont have a human model like Turalyon. Regular orc dont have a brown skin like Garrosh.
Void elf aren’t like Alleria.