Unlock Emo Crys:
At the Credits screen, press Up, Up, Left, Left, Down, Down, Right, Right.

Unlock Jacks Knife:
At the credits screen, press X, A, X, Y, Up, L, Down, Right.

Unlock jay Jay:
At the credits screen, press L, R, A, Left, Right, Y, R, L.

Unlock Lil' Rob:
At the credits screen, press L, Left, Y, R, Right, A, Up, X.

Unlock Spitball:
At the credits screen, press Up, Up, Down, Down, L, R, L, R.