The following characters are unlockable through playing story mode and arcade modes.

Character	How to unlock
Genbu	Beat story mode with Ryuho
Ichi	Beat story mode for the first time
Ionia	Beat story mode with Haruto
Kiki	Beat arcade mode with Genbu
Mycene	Beat story mode with Souma
Pavlin	Beat story mode with Yuna
Poseidon	Beat arcade mode with Sorrento
Shaina	Beat story mode with Kouga
Shun	Beat story mode with Seiya
Sonia	Beat story mode with Eden
Sorrento	Beat arcade mode with Kiki
Unlock Triton Saints	Beat arcade mode with it's saint