Full pause screen:
Pause game play and press R2.

Alternate costumes:
Highlight a fighter at the character selection screen. Press Circle or X to select their first costume, or Square or Triangle to select a second costume.

Fight as Akira:
Successfully complete the game under normal mode as Yugo.

Fight as Quigtao:
Successfully complete the game under normal mode as Yuli.

Fight as Cindy:
Successfully complete the game under normal mode as Douglas.

Fight as Steve:
Successfully complete the game under normal mode as Allen.

Fight as Arthur:
Successfully complete the game under normal mode as Ann.

Fight as Kornelia:
Successfully complete the game under normal mode as Heniz.

Fight as Sessue:
Successfully complete the game under normal mode as Hyoma.

Fight as Mark:
Successfully complete the game under normal mode as David.

Fight as Genya:
Successfully complete the game under normal mode as Saya.

Fight as Zhou:
Successfully complete the game under normal mode as all nine starting characters. Then, complete the game under normal mode once more using any one of the nine starting characters.

Fight as Kaiya:
Successfully complete the game under normal mode as all nine starting characters. Then, complete the game under normal mode once more using any bonus character.

Fight as Jelly/Billy:
Successfully complete the game under normal mode as Kaiya.

Fight as Kazane:
Successfully complete the game under normal mode as Zhou.

Extra mode:
Unlock all twenty-two characters.