Dead or Alive Ultimate Cheat Codes for XBox

Increase Bouncing
Go to the settings and set your age to 99. This will increase how "bouncy" the girls are.
Submitted by: Codec

Unlock Hitomi
To unlock Hitomi, have a DOA 3 save on the Xbox and beat story mode on normal with Ein.
Submitted by: Codec

Unlock Costumes
Beat story mode on each difficulty with every character to unlock every costume.
Submitted by: Codec

Unlock Hair Styles
Press WHITE or BLACK while selecting characters to alter their hair style.
Submitted by: Codec

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

Unlock Tengu
Beat story mode with each character once on any difficulty.

Unlock Bayman
Play for 10 hours to unlock Bayman.

Adjust Camera during Celebration
During the ending celebration after each battle, you can move the camera. By pressing either the left or right trigger, you can turn the screen, up to, 90 degrees clockwise or counter-clockwise. By using the right analog stick up or down, you can move the screen over or under the character.

Alternate Hairsytles
When selcting your character's costume, confirm your selection with either X\Y or the White button to change Kasumi and Lei Fang's hair.
X\Y with Kasumi will give her a pony tail.
White with Kasumi will give her a braid.
X\Y\White with Lei Fang will have her hair down.

Alternate Level Select
Press X on the following stages to play a variation of that level.
The Aerial Gardens
The White Storm
The Great Opera

Extra Collection Items in Survival Mode
While playing in survival, if you punch or kick your opponent while they are lying on the ground, they will drop a collection item.

Unlocking Everything
On the initial page, you have to use each character and obtain their 3 unique items each, as well as the 4 generic items. You also have to obtain the medal which is dropped after your 50th win on survival (any difficulty) Once you have your first page full on the collection, it will open up a second page, with 15 more items. With each of the 15 fighters again, you must obtain their last unique 'rare' item, and upon doing so, you unlock all costumes, cg gallery and the DOA3 booster pack (for those that don't already have it). My thanks to the DOA boards.