One Piece: Aquarius.

Four childhood friends die in an unfortunate accident only to be reborn in the world of One Piece. With each one of them inheriting a special gift to accompany them in this new life, they fight for their own freedom and fun as neither pirates or marines as they journey the world on their own terms not bowing to any force. Dawn Island is the start of a new adventure between the Beast Doppelgänger, Devil Swordsman, Ninja, and Alchemist.