This is a very interesting thread.
A Meowth, maybe? Around people who I'm not used to, a great Japanese phrase could be used to describe my personality: karite kita neko (like a borrowed cat), as I tend to be quiet like a cat out of its territory. However, when I'm around friends and family, I can be super-active and talkitive. I also really love cats. :3
Of course, I've actually seen my guardian angel (or so I believe). When I was young, I got really sick and had to go to the hospital. On the way home, drifting by the side of the car, there was what appeared to be a glowing angel-like form. It didn't have any facial features or wings, but it did seem to have a white gown and blonde hair. In comparion to a Pokemon, I guess I would have to say it looked most like Togetic.