G.A.S.P. Fighter's NEXTream - Platform: Nintendo64

Alternate costumes
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Hold L and press Left or Right at the character selection screen. 
The character portrait will change colors to confirm correct code 
entry. Then, select a character while L is still held. 

Fight as Gouriki
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Press Up(2), Down(2), Left, Right, Left, Right, B, A at the title screen. 

Fight as Reiji
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Press A, B, Right, Left, Right, Left, Down(2), Up(2) at the title screen. 
Note: While fighting as Reiji, press L + R when the health bar is at 
approximately 33% to transform into Yami or Hikiri.

Special stage
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Break down all ten buildings in a single stage. Return to the stage selection 
screen and press Start. Alternatively, successfully complete the game in tag 
team mode under the very easy difficulty setting using only one character in 
under twenty-one minutes. 

Hint: Regain health
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Repeatedly tap C-Up, C-Down, C-Left, or C-Right after being knocked down to 
regain up to two health points. 

Hint: Extra character creation bodies
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Create and train a character until he or she has accumulated over ninety moves. 
Two new bodies (male and female) will be unlocked the next time the character 
creation feature is used.