Unlock the following characters by performing the corresponding tasks in the Wallbreakers mini-game:

CHARACTER - HOW TO UNLOCK
Celsious - Complete Wallbreakers in five minutes or less.
Frio - Complete Wallbreakers.
Kyaro - Tap L, R alternately at the results screen to move the penguin across the screen before the final results appear.
Valkyrie - Press Analog-pad Up and Analog-pad Down, then tap L, R alternately at menu to move Sandra across the screen until two speech bubbles appear.