The Marineford arc of One Piece was, quite easily, one of the most important arcs of the whole story, and it does without saying that it remains, to this day, the most tense arc that Oda has dropped. It has a solid claim for being the best arc in the entirety of One Piece, and that in itself makes this arc very special. The Marineford arc saw the story go through many twists and turns and it all centered around one character in particular, Portgas D. Ace, the pirate who was handed over to the navy by Blackbeard.