Hi y’all I have a question I have a void elf death knight and I’m almost finished the legion achievement but I need to do mage. Is it cool to have two races but in different class?
Personally I don’t like repeats of the same race, but it’s your character so do what you want.
I would at least make them opposite gender though.
IDK, I have 3 void elves (DK, mage and warlock). Play what you like!
You get 50 character slots per account. Each of those characters can be whatever you want them to be. Go buck wild.
Yes. I have 5 undeads and a female gnome of every class they can be.
Play what you like.
Void Elf Mages are hot!
Do it!
In terms of void elves, I have hunter, mage, priest, warrior, rogue, and monk.
I have dozens of Gnomes… some of the same class. Yes, it is okay (though better if they were all Gnomes or Goblins).

Let me check with the universally agreed player-alt code of conduct… Looks like it is indeed cool. There’s a little note here at the bottom. “It’s your account, your money, your time, do what you want. Ignore the haters!”
you do you man, not everyone likes every race
I have one paladin of each race that can be paladins. They aren’t all leveled to max (yet) but I love having them.
I used to force myself to play races I didn’t like just for diversity but they just weren’t fun to play. Now 18/24 of my characters are blood and void elves. It’s a lot more fun to play with races you like 
I have 7 Zandalari and 4 Darkspear.
You do you
If it ticks your tock, play it. You don’t need our permission. I will add that a void elf makes for a great caster, as it’s casts are not slowed by attacks. My alliance lock and priest are void elfs.
My DK and lock both look different, thanks to the new skin color customization, I can have a blueberry warlock, while my DK can either look undead or a normal elf.
Try making them look different, and unique I say.
I love this about Void Elves. My warlock looks like a dark skinned high elf, my mage looks like a void elf and my DK looks like an undead elf.