Select 2-player mode. At the character selection screen press. press Up, Down, Left, Up, Down, Right + A.
Play as Kuroku in Samurai Spirits Tenkaichi Kenkakuden *new*
To play as Kuroko in any game mode, press the Start button at the character select screen. All character portraits will change to Kuroko, and you can pick any one to select him.
Play as Poppy in Samurai Shodown 5
Highlight Galford and press: right, left, right, left, left, right, right, left, left, right + any button.
Play as Zankuro in Samurai Shodown 3.
When selecting your character for a two-player game, with the cursor on Haohmaru, hold Start and move the cursor to each character in the following order: Genjuro, Basara, Kyoshiro, Ukyo, Rimururu, Haohmaru, Shizumaru, Nakoruru, Hanzo, Amakusa, Gaira, Galford, Shizumaru. With the cursor on Shizumaru, press A and B.