They are Monkey D Dragon, the leader of the Revolutionary Army, and Monkey D Garp, the Hero of the Marines, and a Marine Vice-Admiral. Nearing the end of the arc, the Straw Hats are visited by a high ranking Marine, then the identities of Luffy's father and grandfather are revealed.Merry's keel rupturing as the Straw Hats and allies finally escape the ruins of Enies Lobby and rescuing Robin, and the ship dying and getting a sorrowful Viking Funeral.
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Wait is that Merry in the Horizon, who is piloting - Did she just travel to the Straw Hats alone?
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Robin is actually a survivor of Ohara, the sole survivor to be exact, where many scholars lived delving into the past of the world, which was soon destroyed because they figured out the true power behind the Void Century hidden by the World Government. Nico Robin's flashback, in all its details.Blueno soon gets his ass kicked after that. Blueno is set to defeat Luffy and put him beyond saving Robin, but Luffy rises up and then performs the Gear Second move.Long before Marineford, Water 7 was also a Wham Arc. And that's relatively tame compared to the other plot points: the Going Merry is revealed to be damaged beyond repair, Robin leaves the crew for then unknown reasons and supposedly betrays the crew, and Usopp, due to both his own fears of being too weak and Luffy's decision to get another ship, not only leaves the crew as well but also challenges Luffy for the ownership of the Going Merry.The lovable and helpful square-nosed carpenter, the hilarious and badass ventriloquist, the sexy secretary, and the kindly bar owner? Yeah, they're the villains, and part of the World Government's assassination/intelligence organization: Cipher Pol No.This incident provoked Luffy into finding new ways to get stronger, now that he was aware of people like Aokiji. The Straw Hats getting curb-stomped by Aokiji at Long Ring Long Land, even as they all teamed up against him, showed that there were characters vastly stronger than any of the main characters.