Mucho Bounce-o
Go to the settings and set your age to 99.
This simple trick will increase how "bouncy" the girls are. Not sure about the male characters though...

DOA3 Booster Pack
To unlock a bunch of extra costumes for your fighters in DOA3, simply unlock all the alternate costumes in Dead or Alive 2 Ultimate. The Booster Pack will appear as a ninja star on the main menu and you can upload the outfits from there. You'll also receive a CG Gallery for your trouble.

Hair Styles
Press WHITE or BLACK while selecting characters to alter their hair style. Very important.

Hitomi
To unlock the amazing Hitomi, have a DOA 3 save on the Xbox and beat story mode on normal with Ein.

Tengu
Beat story mode with all characters once (any difficulty works).

DOA1 Adjust Replay
After winning a round, but before the replay screen shows, hold down the Hold and Kick buttons. There will be a fast forward and Rewind icons on the bottom left of the screen. By holding down the Kick button, you rewind the video. While not holding the Kick button DOWN, you allow the replay to playing.

DOA1 Selecting Win Pose
Hold either Hold + Punch, Punch + Kick, or Hold + Punch + Kick. There is a fourth pose if you win unharmed.

DOA1 Unlock Extra Options
Once any of them become available, they can be accessed in the Extra Config screen in the Option Section.
Danger Bounce: (adjust how high a character flies when they hit a danger zone) Enter "DOA" as your initials.
Ring Size: Complete Arcade Mode once with any character.
Fighting Order: Finish Time Attack Mode in under 5 minutes.

Unlock Announcers
Complete Exercise Mode in the Sparring, Single Battle Mode. Only Kasumi, Ayane, Tengu and Ein are unlockable.

Bayman
Beat the story mode with Leon on normal to unlock Bayman.

Change Arenas
Press X or BLACK while selecting a stage to alter the arena.

Costumes
Beat story mode on each difficulty with every character to unlock every costume.

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