Characters for VS Mode...
	Transform into Overlimit Chopp...
	Unlock Survival Mode...

Character	How to unlock
Aokiji	Beat him in the Dimension Zone.
Arlong	Beat him in story mode at the Cave area.
Bon Clay	Defeat him at the Seaside Zone area.
Calgara	Beat him at Jungle Zone near a fishing spot.
Crocodile	Beat him at the Cave area he is the second boss to reach him hit the wall with a character not a pick axe.
Don Krieg	Defeat him in the Jungle Zone.
Eneru	Beat him in story mode at the Ruins Zone area.
Kaku	Defeat him in the Jungle area.
Lucci	Defeat him in the Dimension Zone.
Mihawk	Beat him in story mode at the Fossil Beach area.
Paulie	Beat him at Cave Zone.
Portgas D. Ace	Defeat him in the Mountain Zone.
Rampaging Chopper	Beat him in Mountain Zone, you need a Revive Medicine to get to his arena.
Shanks	Defeat him in the Mountain Zone.
Smoker	Beat him right before you enter Fossil Beach.
Spandam	Beat Spandam at the Ruins zone he is the first boss.
Vivi	Beat her at Ruins Zone.
Whitebeard	Beat him in the Dimension Zone. Golden Whale is required to get to the arena.

In order to do this, you must have completed 2 previous tasks:

Defeat Overlimit Chopper in Story Mode
Create the Rumble Ball

After achieving those requirements, you will now be eligible to transform into Overlimit Chopper. To do so, you first must be in a boss fight. While in the fight you have to use TWO Rumble Balls (wait for one to run out, heal SP gauge, take another one). While you are using the second Rumble Ball, the enemy has to kill Chopper. Instead of dying, like he normally would, a cinema scene occurs. The scene shows Chopper taking a third Rumble Ball and he transforms into his Overlimit form. He gains a new HP and SP bar. He isn't able to use items.

In order to unlock Survival Mode, you must unlock the following characters in vs. mode. All characters MUST be defeated to unlock them. All locations given are the first location you encounter each enemy.

Effect - Code

Bazooka Marine - Defeat one in the Seaside Zone
Blue Demon General - Defeat one in the Cave Zone
Cluster Demon Soldier - Defeat one in the Cave Zone
Crimson Demon General - Defeat one in the Cave Zone
Knuckle Pirate - Defeat one in the Ruins Zone
Marine Corps Chief - Defeat one in the Jungle Zone
Normal Marine - Defeat one in the Seaside Zone
Pistol Pirate - Defeat one in the Jungle Zone
Sabre Pirate - Defeat one in the Jungle Zone
Sword Demon Soldier - Defeat one in the Cave Zone
World Government Agent - Defeat one in the Ruins Zone