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Nintendo 64 - G.A.S.P. Fighter's NEXTream cheats

Unlock Gouriki as playable character:
Hit Up, Up, Down, Down, Left, Right, Left, Right, B, A at the title screen.

Unlock Reiji as playable character:
Hit A, B, Right, Left, Right, Left, Down, Down, Up, Up at the title screen.

Transform Reiji into Yami or Hikiri
While playing as Reiji and the health bar is at aronud 33%, tap L + R 

Hidden level:
Destroy all of the 10 buildings in a single level. 
Go back to the level selection menu and hit Start to get access to 
the new level.
or
Finish the game in tag team mode in very easy mode by using a single 
fighter in less than 21 minutes. 

Change costumes
Go to the fighter selection screen, hold L and press Right or Left 
after, keep held L and choose a character.

Restore health:
After being knocked down, enter several times the following code:
C-Up, C-Down, C-Left, or C-Right

New creation bodies:
Train you created character until she/he has reach over ninety moves.