Play as GYN
Enter the options screen and set the difficulty to normal, and choose two round mode. Then, beat story mode with any character to unlock GYN in any mode except story mode.

Play as Ray
Enter the options screen and set the difficulty to hard, and choose two round mode. Then, beat story mode with Hana to unlock Ray in any mode except story mode.

Play as Zorr
Enter the options screen and set the difficulty to hard, and choose two round mode. Then, beat story mode with Juie to unlock Zorr in any mode except story mode.

Alternate Costumes
Press Z when selecting a character in any mode except story or practice.