Highlight the "Continue" option at the "Continue/Delete Data" prompt and press Start + A. Highlight a saved game and press Start + A to display a prompt to control the game's enemies. Note: This may only be enabled in books one through three.
Name the main character, highlight the "End" option, and press Start + A. All game characters, including bonus characters, may be renamed.
Press Up, Down, Up, Down, B, then hold Start + A + C at the title screen. Keep the buttons held until the main menu appears. Select a name, then quickly hold Start + A + C.
Hold A + B + C and sweep the D-Pad on controller two clockwise at the "Software Planning" screen.