Zach, Bayman, Sarah, Akira, Brad, Eliot, Hayabusa, Hayate, Kasumi, Ayane, Kokoro, Hitomi, Rig, Bass, Tina, Christie, Leifang, Jann Lee, Lisa,.. Add Helena, Pai, Gen Fu & Mila... So that is 23, so there would be 1 secret character (maybe swap Pai over to unlockable for 2) That leaves one Mystery...