Cheats > Game > Cheat: 47629

Same color opponent
7847

Start the one-player game, then join in with player two and pick the player the computer was using. Kill player one. Do not continue and your character will start with the one-player game again. Join in with controller one, and again pick the same character the computer was using. Kill player two. When the next one player game starts, your character will be the same character and color as the computer.