Play as a student
At the character selection screen, hold L1 + L2 + R1 + R2 and select a character. Different characters will result in different Dojos and students.
All hidden characters
Defeat all Dojos in single player mode to unlock all the hidden characters in versus and tournament modes. All the silhouettes will be replaced by the faces of the Dojo Masters.
Confuse opponent
During a match in versus mode, repeatedly press X + Circle to make it unclear whether you are going to attack.