Dancing Girl 2 is a secret character that you can unlock when you find and buy the Secret Characters Parcel or enter the Secret Characters Cheat Code in the Classroom. Once you've purchased the parcel or entered the code, activate the "Secret Characters" option in the Extras menu. This character only appears in the Shanghai Showdown level in Free Play. You won't see her on the character selection screen, but she will be available when you toggle through all the characters while playing. She has short black hair.