First make a backup copy of the file vcop2.ini which is located in the game install folder. Then open it with any text editor find the Game Setting and add the line:
Now during gameplay Special and Cheat options will appear when Mode Settings F6 is selected.
Play as Silver Dural
At the Fighter Selection screen press Down Up Right Guard/Kick Left.
Play as Gold Dural
At the Fighter Selection screen press Down Up Left Guard/Kick Right.
Play as Dural
Highlight Akira and press Down Up Right Left and A.