Extra Costumes
To get the extra costumes for any character, beat the game with that character. For instence if you beat the game with Danzaiver you get his extra costume in the vs mode or the 1 player battle mode.
Play as Boss and Hidden Stage
To play as boss and access the hidden stage, beat the game with 3 different characters in story mode.
Play as Ihadurca
To be able to play as Ihadurca, beat story mode with Setsuna.
Winning Postures and Poses
Each character you beat in story mode will earn you 7 new postures.