Well, I'm a horse. What can you say?
Honestly though, I would like to be a Hobbit. A Took, probably, since they are more adventurous. That's a good character, in case you haven't figured it out. There are definitely many things about Hobbits that appeal to me, not least of all the simplicity of their life.
Or if I couldn't be a Hobbit, I would be a Rohirrim. Another good character.