Play as Cao Cao
Complete the game with Xiahou Don, Dian Wei, Xu Zhu, Lu Xun, Taishi, and Diao Chan. Then at the selection screen move the off to the right of the screen.
Play as Nobunage
You much first unlock Zuge Liang,Lu Bu, Cao Ca and at the title screen press Press Up, Triangle, Down, X.
Play as Sun Shang Xiang
At the Title screen highligh "1P battle" and press left, left, up, down, triangle, sqaure, L1 and R1.
Play as Toukichi
First unlock Cao Cao, At the title screen press Down, Down, Right, Up, Circle, Triangle, R1, and R2