When you lose the fatality round to your opponent, hold HK + HP. When you hear "FINISH HIM!" the CPU will perform His/Her fatality.
To change your fighters color or clothing, press the following button sequences at the character select screen:
Kai: Hold Start, HP+BL+LK
Raiden: Hold Start, LP+BL+HK
Shinnok: Hold Start, HP+BL+LP
Liu Kang: Hold Start, HK+BL+LK
Reptile: Hold Start, LP+BL+LK
Scorpion: Hold Start, HP+HK+BL
Jax: Hold Start, RN+LP+BL
Reiko: Hold Start, RN+HP+LK
Johnny Cage: Hold Start, RN+LP+LK
Jarek: Hold Start, HK+HP+RN
Tanya: Hold Start, HK+LK+HP
Fujin: Hold Start, LP+HP+HK
Sub-Zero: Hold Start, RN+BL+HP
Quan Chi: Hold Start, HP+RN+HK
Sonya: Hold Start, LK+HP+RN
At the Character Select screen, hold START on the character you want to be and press LK HK RN.
Kombat Kodes are entered at the VS screen using a button to control each of the six boxes. The numbers represent how many times you press the button.
To play as Meat, beat the game on Team Mode then play again and you'll be playing a Meat. Meat will have the moves of the character you selected.