Dwarf is viable as a rogue if you count those Dark Irons (but in that logic, so is Dwarven Warlock) and Twilight Hammer secret members
Human makes sense in most stuff
Gnome probably makes sense as a rogue too (small size and all). As a Warrior, probably those recruits in front of Stonegear's can count as some, or those guards in Clean Zone (they got coif and mail armors too).
Troll Shadow Priest was a thing in WC3. Troll shaman might make sense as well. Those Witch Doctors use totems after all.
So is Blood Elf/High Elf Priest (in fact that's the only playable Priest Alliance has in WC3). Warlock would also be their thing due to the result of their addiction and trafficking with Illidan
Night Elf Priests are eeeeh because Tyrande in WC3 looks more like huntress than priest. Never get to raid her though, cuz I'm Alliance.
Tauren Druid is.... ok, but they look like they fit Shaman more
Draenei Mage makes sense because... they are Eredar, right? They're really good at magic. Arcane magic, they might still touch.