Fight as Boro:
Complete the game under the easy difficulty setting. 

Fight as the Joker: 
Complete the game to earn a star. Select "Survival" 
mode. Defeat all one hundred characters. The Joker 
will be available on the character selection screen. 

Fight as the Master: 
Complete the game to earn a star. Select "Master 
Challenge" mode and defeat all opponents. The 
Master will be available on the character selection 
screen. 

Fight as Robert: 
Complete the game to earn a star. Select "Fastest" 
mode. Defeat all fighters in less then one minute. 
Robert the robot will be available on the character 
selection screen. 

Fight as Ushi: 
Complete the game to earn a star. Select "Rodeo" 
mode. Remain undefeated for at least one minute. 
Ushi the cow will be available on the character 
selection screen in two choices of colors. 

Winning poses: 
Rapidly tap A or B after defeating your opponent.