Dead or Alive

Playstation

Extra voices:
Go to training and press start. Set the option so you display the move name to practice. Do every move. When you do the last move, it'll say "great". Now go back to options and go to extra config. Go to extra voice. Now select extra for your character. Now when you win, you'll say something different for your win pose. You can do this for every character.

Get more costumes:
Set your options so that everything is at its default settings. Beat the game and you'll achieve one new costume every time. There are a total of 14 for each female and 5 for each male.

Extra config:
Approximately three hours (3,6,9,12,15...) will give you an extra config in options mode. When the time in extra config passes a multiple of three, play and lose so you'll go back to the Main Menu. It will say you'll have a new extra config...

Play as Raidou:
Unlock all characters and costumes. Choose costume 14 (famle) or 5 (male) and beat the game under Normal difficulty with default settings.

Play as Ayane:
Beat the game with Raidou to unlock Ayane.

Game Shark codes

Infinite Health P1		80093c30 00a0
Low Health P1			80093c30 0001
Infinite Health P2		80093c88 00a0
Low Health P2			80093c88 0001
Enable Extra Config Menu	80092cda 7f40
Extra Voices			80092f90 0001
				80092f92 0001
				80092f94 0001
				80092f96 0001
				80092f98 0001
				80092f9a 0001
				80092f9c 0001
				80092f9e 0001

Thanks to Revolution readers Kenny, Mangler87, Mike Tussey, K.T. Card, and Goku!