Fight as Zhuge Liang:
Finish the game with Guan Yu, Zhang Fei and Zhao Yun. The, press Left at the character selection screen.

Fight as Cao Cao:
Finish the game with all characters except Guan Yu, Zhang Fei, and Zhao Yun.

Fight as Lu Bu:
Finish the game with Zhuge Liang and Cao Cao.

Fight as Toukichi:
Enable Zhuge Liang, Cao Cao, and Lu Bu. Quickly press Down(2), Right, Up, Circle, Triangle, R1, R2 at the title screen in the North American version of the game.

Fight as Nobunaga:
Enable Lu Bu. Quickly press Square, Up, Triangle, Down, Circle at the title screen. A sound will confirm correct code entry. Nobunaga is located to the right of Shun Shang Xiang. For the Japanese version of the game, quickly press Square, Up, Triangle, Down, X at the title screen. Choose this character by pressing L1 or R1 at the character select screen. He has basically the same attacks as Lu Bu.

Fight as Sun Shang Xiang:
Quickly press Left(2), Up, Down, Triangle, Square, L1, R1, on the one player battle screen. The sound of a sword will confirm correct code entry. Choose this character (a girl), by pressing L1 or L2 on the character select screen.