Fight as Minazuki Zankuro:
Select versus mode and enter the character selection screen. Hold Start and highlight the following fighters in order: Haohmaru, Genjuro, Basara, Kyoshiro, Ukyom Rimruru, Haohmaru, Shizmarum Nakorurum Hanzo, Amakusa, Gaira, Galford, Shizmaru. Allow the timer to reach "03" while Shizmaru is highlighted, then press A + B. Minazuki Zankuro will appear in the center of the bottom row of fighters.

Blood mode:
Enter the options screen and highlight the "Exit" selection. Press A + B + C + D to enable blood.