Enter these codes at the character select screen using the number keys on the keyboard. The general boss code only needs to be entered once, while the code for JAW must be entered each time you want to select him, and is different for player 1 and player 2.

Effect	Code
Play as Chieshen, Wacker, & Cula	Type 2604352 at Character Select Screen using number keys.
Play as JAW (Player 1 ONLY)	Type 19668101 at Character Select Screen using number keys.
Play as JAW (Player 2 ONLY)	Type 19668102 at Character Select Screen using number keys.