Wilma the Wigglytuff
Do not let that cute face deceive you and take a look in those eyes. Wigglytuff would be an absolutely brutal opponent, her massive eyes never looking away, her sweet smile never leaving the round face, as she executed jab after jab, never stopping, never stepping away. And as a person outside the ring? Lets just say, don't get on her bad side. She has a hell of an ego.