Following the recent announcement of bonus characters being available within Theatrhythm Final Fantasy, new information and screenshots have been made available. In order to unlock these characters, you will need to collect crystal fragments throughout the game. Once you find all of them you can unlock the character. This includes Aerith (Final Fantasy VII), Snow (Final Fantasy XIII), and Prishe (Final Fantasy XI).
All characters within the game will be able to level up. As you do so, you can develop four stats: strength, magic, speed, and luck. Luck will increase your chances of finding items on the ground. Theatrhythm will also double as a portable Final Fantasy soundtrack collection and a video museum. You will be able to unlock songs and movies to watch and listen to.