Namco-Bandai has revealed more information about the battle system and other aspects of gameplay, as well as more screenshots, in the latest update for One Piece: Unlimited World RED.
The Strong Word system takes advantage of the bonds between party members which can power up their stats, such as HP and attack power, and provide other bonuses. This system can be classified into three categories: Skill Word, Custom Word and Item Word, and each one nets rewards and loot. Skill Word allows for characters to use special abilities while Custom Word makes the characters themselves and their special abilities stronger. Item Word governs how many items a character can have equipped to them (for instance Nami, Usopp and Brook can have four items).
Classic characters from the series will also be making an appearance, including Smoker, Tashiga, Ace and Buggy the Pirate. You can check out the entire gallery posted below, which shows off more of the combat system.