Enter the following at the password screen. An underscore indicates a 'Space.'

Super code:
Enter NARPAS_SWORD0_0000 and put 8 spaces after the last zero.

Bonus weapons for Samus:
Enter JUSTIN_BAILEY_------_------

No suit:
Enter 999999_999999_KKKKKK_KKKKKK

Special thanks to Revolution reader Aranite!