Someone from the World Government. The Government are consistently portrayed as the object of misfortune everywhere the Straw Hats go. They are what divide the world, they are what strip people of their freedom, and they are afraid of those who challenge their authority in serious ways.
Luffy and Teach are the top contenders to toppling them, depicted by IM-sama obsessing over their bounties.
You could argue that the World Government are simply the holders of the prize, which is the world itself, and that the story will end with Luffy and Teach battling for fate of the world after the Government is stripped of it in the final war. This would make Teach the final opponent of the story.
My perspective is that Teach will be Luffy's final Pirate obstacle, and that will be represented with Teach standing in Luffy's way just before he retrieves the One Piece. The way Newgate recounted right before his death, the fate of the world would rest on the one who finds the One Piece, challenging the Government which currently holds it. The two forces at play being emphasized are Luffy and the Government.
Luffy and Teach are the top contenders to toppling them, depicted by IM-sama obsessing over their bounties.
You could argue that the World Government are simply the holders of the prize, which is the world itself, and that the story will end with Luffy and Teach battling for fate of the world after the Government is stripped of it in the final war. This would make Teach the final opponent of the story.
My perspective is that Teach will be Luffy's final Pirate obstacle, and that will be represented with Teach standing in Luffy's way just before he retrieves the One Piece. The way Newgate recounted right before his death, the fate of the world would rest on the one who finds the One Piece, challenging the Government which currently holds it. The two forces at play being emphasized are Luffy and the Government.