Hey, the pokemon in your avatar, Oshowatt, is such a cute one. I chose it in both the gen 5 games(B/B2). Even i love it a lot(but not as much as i like charmander).
I actually like all three, but Buttercup is the one I easily relate to personality-wise. I have aspects of all three - the intelligence of Blossom, the cuteness of Bubbles, and the toughness of Buttercup.