One Piece: Gigant Battle

You start in Schabondy Island and as you progress through each battle stage, you unlock new secret levels, characters, moves and even art pictures. You also unlock previous arcs which as Skypiea and Enies lobby. Over 20 or so different characters to play, including some of the fan favourites, Ace, Whitebeard, Jimbei, Ivankov, many more and obviously including the Straw hats. Along with support characters which are small characters in the series, such as Duval, the fighting seals you see in Alabasta, you can even have a few of your favourite Straw hats as your support characters. A lot of fun, with a great levelling up system with challenges in each battle to earn more Beli to purchase moves for your character and to become stronger.