Illidan

[Husky]

It's rumored that he drops the also rumored "T6".

He is the Boss of that Black Temple place.

There's a movie on Warcraftmovies.com that has all the Tier 6 sets if you wanna look at them. Also shows Illidan's death animation at the end if you havn't seen it.

 

[Ur-Quan]

All demon hunters don't have eyes.
The story about it is that they don't want to be corrupted by persuading evil.
So they hone their other senses.

 

[Prometheus]

You can morph into things with wings, on legit. With those Halloween staff things.

But can you fly with them? No.... =(

Edit: Hunter T6 looks like Shammy T3.