So a week or so ago there was a topic where a guy asked what the difference between a normal class and hero class was. One of the posts made a point I hadn't thought of before. While there are characters who match up with all classes, they typically fit with only one spec. Hero classes though are built 100% around one lore character. Arthas embodies everything that a Death Knight is, same with Illidan and Demon Hunters. With this in mind, I tried thinking about what other possible hero classes are even possible if that's a requirement.
Tinkerer might be linked to Mekkatorque but a class based around a racial leader seems like a bad idea to me. Shadow Hunters would be cool, but same issue here as with Tinkerer. Even if Vol'jin comes back as a 'neutral' Loa to teach the ways to Trolls and Night Elves, it would likely feel off.
And that ends the entire list I've been able to think of. I discounted Necromancer since Kel'Thuzad is dead and I can't think of any other big name nercomancers. Any other classes I could think of were pretty much pulled out of thin air or other games. Ideas that might be fun, but no existing lore figure to fit or define them. Any more you guys can think of?