Reina - On the title screen, press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A.
Aniki - Beat story mode with Musica.
Beast King - Beat story mode with Haru on hard without using continues, and then beat Beast King.
Gale - Beat story mode with Shuda.
King - Beat story mode with Haru.
Poosya - Beat story mode with Elie.
Sieghart - Beat story mode with Go.
Outlaw - Beat free mode in a 2-on-1 setting with Aniki on hard.