Alternate Arcade and MOM Modes
Either
Defeat them in Survival mode they appear at levels 210 220 and 230
or
Complete all endings in Story mode
or
Complete 40 missions in mission mode
Alternate Way to Unlock EX and SP Modes
Unlocking Justice Robo Ky and Kliff the lazy way
Place your PS2 in training mode for 4 days 96 hours total
Note that the 96 hours includes the play time as well so the requirement may be less than 96 hours depending on how much time you spent on this game in game wise not on the starting screenmenu
Change Victory Pose
To select a different stage highlight a character and press R2
Fight as Justice
Defeat Justice in level 230 of survival mode Alternately complete all 60 story mode paths successfully complete 40 missions or accumulate 96 hours in training mode and normal game play
Fight as Kliff
Defeat Kliff in level 220 of survival mode Alternately complete all 60 story mode paths successfully complete 40 missions or accumulate 96 hours in training mode and normal game play
Fight as Robo Ky
Defeat Robo Ky in level 210 of survival mode Alternately complete all 60 story mode paths successfully complete 40 missions or accumulate 96 hours in training mode and normal game play
Fight EX opponents
Hold L2 when selecting either Arcade or MOM mode
Fight SP and EX opponents
Hold L1 L2 when selecting either Arcade or MOM mode
Fight SP opponents
Hold L1 when selecting either Arcade or MOM mode
SP fighters
Defeat an SP character in survival mode Then hold L1 when choosing that fighter at the character selection screen to play as the SP version Alternately complete all three story mode paths for a fighter to unlock the corresponding SP character or successfully complete 40 missions Note For SP versions of Kliff Justice and Robo Ky complete 50 missions Another way is to accumulate over 60 hours of game play For every 2 hours of game play over 60 hours one SP character will be unlocked