GREAT MUTA
Press O, Right, T, Up, S, Left, X, Down, X, Down, S, 
Left, T, Up, O, Right, and Select. This will give you Great Muta 
if you select the third character from the top on the fighter 
select screen.

                              POWER WARRIOR
Press S, X, S, X, O, T, O, T, Up, Down, Left, 
Right, and Select. This will give you Power Warrior if you select
the seventh character from the top on the fighter select screen.