Sophitia!: Finish Edge Master mode as Sophitia and collect all eight of her weapons. At the fighter-select screen, put the cursor on Hwang and press Left once. You should land on a hidden ?-box, Sophitia!. Now you can play as Sophitia without any armor.
Sophitia!!: Collect eight weapons for every character in Edge Master mode. At the fighter-select screen, put the cursor on Hwang and press Left once. You should land on a hidden ?-box, Sophitia!!. Now you can play as Sophitia in a one-piece swimming suit. Siegfried!: Finish Edge Master mode as Siegfried and collect all eight of his weapons. At the fighter-select screen, put the cursor on Cervantes and press Right once. You should land on a hidden ?-box, Siegfried!. Now you can play as Siegfried, who is possessed by the evil power of SoulEdge.
Play as SoulEdge: Finish the game in Arcade mode on any skill setting with all 10 characters. At the fighter-select screen, SoulEdge should appear between Mitsurugi and Siegfried.
Play as Han Myong: First, unlock SoulEdge (see cheat above).
Finish Arcade mode as Hwang, then Žnish Arcade mode again as Seung Mina. At the fighter-select screen, put the cursor on Hwang, and press Left until you find a hidden ?-box, Han Myong. Han's fighting style is similar to Hwang's.