A Horde night elf.
"the Wood Elf", or if you like Warcraft, "the Night Elf"
Yes you can play a Night Elf on WoW. Also Night Elves are Alliance.
Now and then Blizzard places an NPC Night Elf Mohawk in game who sells Mohawk Grenades. Anyone who is hit by them will have the face of the Night Elf Mohawk in the commercials. However, the closest thing to a Night Elf Mohawk is a Night Elf character with the single-ridge of hair in their hairstyle, which is not very impressive.
Yes, the Night Elf race is an Alliance race. You do not need Burning Crusade to be a Night Elf. It is included with the "vanilla" version of World of Warcraft.
brownie elf
There really isn't an "Ultimate Night Elf Druid" in World of Warcraft.
MJ's Thriller
Darnassus
Larrian Gillespie
It is not. You can make a male Night Elf, and change the haircut at a barbershop. The commercials were meant to attract more players.
:)