Why?
Not going to lie, I had seen pictures of draenei and the Raven Lord mount, and thought they were wicked cool. I had only played one MMO beforehand. So draenei and mounts are essentially why I started playing WoW. xD
Which Race?
At the very beginning, I went Night Elf. When I finally bought the game I went Blood Elf. Now, I'm mostly worgen and draenei -- they're my favorite races.
Which Class?
I've switched a bit over the years, but hunter has always been my main. Pets mean the world to me. I love hunters.
Why Horde/Alliance?
I've switched over the years, and I'm Alliance now because I just love draenei and worgen. I do have Horde characters, though. I'm not particularly a one-faction type of person, I can easily switch between them without caring much. I love a lot of the races though, and sometimes I think it's a shame I can't just play a race I like while still being able to be with my friends.