alternate costumes
Elie's different costume and picture beat 1 on 3 on hard with Elie Haru's different costume and picture beat 1 on 3 on hard with Haru Musica's different costume and picture beat 1 on 3 on hard with Musica
free modes
1 on 2 free mode complete all story mode storys 1 on 3 free mode unlock everyone and beat free mode with each one
Unlock Story Edit Mode Beat Story Mode with each character to unlock the Story Edit Mode.
Unlock extra characters
Unlockable How to Unlock Gale Complete Story Mode with Shuda King Complete Story Mode with Haru Pasha Complete Story Mode with Elie Read Admiral Complete Story Mode with Musica Sieg Hart Complete Story Mode with Go
Unlock Outlaw First beat story mode with everyone to unlock VS 2 enemies at once in Free mode. Then select Rear Admiral in Free Mode and set it to 1 on 2 with dificulty set to Hard. After you beat it, you will have unlocked Outlaw
Unlock the Beast King Go to story mode, select Haru and put it on Hard. Beat it without continuing and after round 7, King will transform in a Beast. Beat him and you'll unlock this second form of King, The Beast King.
Unlock Reina At the title screen press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A. If done correctly you will hear a voice, and Reina is unlocked.
To Unlock round call for a character you must beat free mode with them in a 1 v 2 setting.
https://gamefaqs.gamespot.com/gamecube/926690-rave-master/cheats