The Darkfallen. For some reason, I liked having vampires in WoW. But I guess it would have sucked (no pun intended) if they went all Twilight on them.
General Tiras'alan of the SSO, who died in Theramore.
Medivh. Man I wish he was around more.
Infinite Dragonflight. I want a mount of one soooooo bad. Also, I hope that we somehow can still have CoT dungeons or raids. Would love to join Grom and Thrall in killing Mannoroth or something. I would also like to see a CoT that has something to do with Gul'dan.
Lor'themar Theron...oh wait, he's alive...just neglected. Sorry, couldn't resist