Ex Fighters
Defeat an EX character in survival mode, Then, hold White when choosing that fighter at the character selection screen to play as the EX version.
Sp Fighters
Defeat an SP character in survival mode. Then, hold L when choosing that fighter at the character selection screen to play as the SP version.
Ggx And Ggxx Mode
Successfully complete 70 missions.
Fight As Kliff
Successfully complete 50 missions.
Fight As Justice
Successfully complete 50 missions.
Fight Against Gold Fighters
Highlight the 'Arcade' or 'M.O.M.' mode options, then hold L while selecting it. You will fight against gold opponents in that mode.
Fight Against Ex Fighters
Highlight the 'Arcade' or 'M.O.M.' mode options, then hold White while selecting it. You will fight against EX opponents in that mode.
Fight Against Gold Ex Fighters
Highlight the 'Arcade' or 'M.O.M.' mode options, then hold L + White while selecting it. You will fight against EX opponents in that mode.
Easier Way To Get EX Mode
Play the game for 50 hours.