Ranma ½: Chounai Gekitouhen

Play as Colon and Happy:
Highlight the "Vs mode" option at the title screen then hold L + R and press A. A hidden menu will appear. Select "Who" to be able to choose Colon or Happy as a character.

Character selection:
Highlight the "Vs mode" option at the title screen then hold L + R and press Left or Right to select any character except for Colon and Happy.

50 credits:
enter the options menu, then highlight "Credit" and press Select(10).

View ending sequence:
Select single player mode and intentionally lose a match. Do not continue and return to the title screen. Highlight the single player mode option, then press Start on controllers one and two simutaneously.