FAQ GameCube

Soul Calibur II

-Play as Yoshimitsu

Use Weapon Master mode and finish chapter 2.  Beat Yoshimitsu in the last area and he will become playable.

-Play as Cervantes

Use Weapon Master mode and finish chapter 3.  Beat Cervantes in the last area and he will become playable.
Play as Charde
Use Weapon Master mode and finish chapter 2.  Beat Charde in the first area of chapter and he will become playable.  You can only win with a ring out in the match.

-Play as Sophitia

Use Weapon Master mode and finish chapter 4.  Beat Sophitia in the last area and she will become playable.
Get Character Bios and Demo Theatre

Use any character to finish arcade mode or extra arcade mode.

-Play as Seung Mina

Use Weapon Master mode and get to chapter 6.  Beat Seung Mina in the "Palace Icon" area and she will become playable.

-Another Practice Mode

Finish weapon master mode using any character.

-Another vs. Mode

Finish extra arcade mode using any character.

-Another Arcade Mode

Finish arcade mode using any character.
-Unlock Characters in Weapon Master Mode

Play through Weapon Master mode to unlock characters, modes and stages. As you beat a character in Weapon Master Mode, that character will be unlocked for use in other modes. Unlockable characters include: 

Cervantes 
Charade 
Lizard Man 
Seung Mena 
Yoshimitsu