Within a recent SpotPass update, Team NINJA have detailed how owners of Dead or Alive: Dimensions are able to unlock a hidden 26th character, Shiden.
Details are as follows:
You will need all 25 characters unlocked first. On the CHARACTER SELECT screen, move the cursor over “Random” and press the button combination for the costume you want to use (see below), then press A.
* Costume 01: L + X
* Costume 02: R + X
* Costume 03: L + R + X
Shiden–father and teacher of Kasumi and Hayate. Now the power of this legendary ninja is in your own hands!
So, there you have it! You can catch our review of Dead or Alive: Dimensions through this link.