Gunbird 2 - Platform: Dreamcast

Play as Morrigan 
----------------
At the character selection screen, highlight the 
question mark option and press Up. 

Play as Ain
----------- 
At the character selection screen, Highlight the 
question mark option and press Down. 

Debug mode
----------
Power on the Dreamcast, then hold Start at the Sega 
logo. Keep Start held until a debug menu appears. 
This menu has options for stage selection, 
invincibility, infinite bombs, music test, and to 
hear the Japanese intros/endings cut from the US 
version. Note: If the memory manager screen appears, 
press Start and the debug menu will appear after it.