I would want to be some type of bird. I have had many dreams that I could fly and it was awesome. I think I'd like to be an owl, because they are active at night and have incredible vision. And they're pretty. I can't imagine what it's like not to have arms and hands, but I think it would be cool to have feathers. I really don't like having birds as pets, but I'd love to be one.
An axolotl with a laser death ray evolved to emit from my head.
Of already evolved animals, a chimera of bear, albatross, trilobite, and rough-skinned newt.
Spotted wobbegong australian carpet shark! Lol jk. I'd be something furry. And definitely fat. I love fat, lazy animals. They always want to snuggle so much more than their hyper/skinny counterparts.