Wait until the blank screen after the Namco logo appears, then press B, A, B, Y, B, A, B, Y. A sound will confirm correct code entry. Youko Kurama, Shoujo Genkai and 100% Toguro will now be unlocked. To select them, highlight their normal version at the character selection screen then press L or R.
Wait until the Namco logo appears, then quickly and repeatedly press L + R.
Press Y(7), X(6), A(5) at the title screen.