Characters
Each Rose has two personas in the game's story mode. You start with the default persona. For example, Reiko is a protagonist, while her default Anesthesia is an antagonist, or heel. Complete Reiko's fights in story mode and you unlock Anesthesia. For versus mode, you have to fulfill certain conditions to transform the character's persona into the other. For example, doing "evil" things such as taunting the opponent will gradually transform your character into a heel. A full list of conditions is available in the match menu. Finish the story modes of all characters to unlock the end bosses, Lady X and Lady X Substance.
Swimsuits
Each character has a swimsuit costume to unlock. Enter "down," "left," "down," "left," "down," "left," "down," "square" and "select" in the main mode select screen. You should hear a sound if you entered the code correctly. Alternatively, winning and defending the title successfully in versus mode unlocks that character's swimsuit.
Beach Arena
Unlock the beach arena in the main mode select screen with "down," "right," "down," "right," "down," "right," "down," "square" and "select." The beach arena is significantly different from all the other wrestling rings. It does not have ropes bordering the sides, and the ring floor is sand or mud. It has ladders on two opposing corners. The Roses can jump from these ladders to deliver a high-flying attack.
Entrance Swap
You can switch your character's entrance video with that of your opponent. Select exhibition mode and pick either a normal or a title match. Select any opponent as well as any ring (to get the full effect it has to be a normal wrestling ring). Hold the "L1," "L2," "R1" and "R2" buttons as you select play, and keep holding them until you see the new entrance.
Miscellaneous
Each Rose has a hidden interview in the gallery mode. To unlock a character in gallery mode, you have to win the title as that character. After picking a character in gallery mode, do not press anything for a few minutes; the game will automatically enter the interview mode. If you need to clear the pause screen during the match, press "start" then "select" at the pause menu. If you want the game to pick a Rose to fight, go to the character select screen and press and hold "L1," "L2," "R1" and "R2" to initiate a random selection.