As One Piece has grown in both length and cast size, Oda has created dozens of rivals and enemies for the Straw Hats. Can you help me figure out which battles we absolutely have to see before the manga can end?
Luffy vs. Kidd (both Supernovas, diametrically opposed in their view of a good Pirate)
Luffy vs. Smoker (I could see this being one of his first battles after the training arc. Though I really expect the first battle to be the Straw Hats meeting at Shabondy and each defeating a Pacifista.
Luffy vs. Magellan (Revenge for Impel Down and for Bon Clay)
Luffy vs. Sentoumaru (He beat Luffy back at Shabondy)
Luffy vs. Akainu (Ace grudge match!)
Luffy vs. Aokiji (Revenge for what he did while trying to capture Robin)
Luffy vs. Kizaru (He and Sentoumaru scattered the Straw Hats back at Shabondy)
Luffy vs. Red-Hair (I could see this not happening, and perhaps Blackbeard killing Shanks and then Luffy killing Blackbeard in a double-rebenge fight, but it is also highly possible that Luffy will have to fight him as the final hurdle between him and Raftel, where Blackbeard could be waiting)
Roronoa Zoro vs. Mihawk (Strongest Swordsmen in the world!)
Luffy Vs. Blackbeard (Final battle, methinks, with the accompanying mini-battles of Usopp vs. Van Auger, Sanji against perhaps Burgess, Zoro vs. Shiryuu of the Rain, etc)
Can you think of any other battles?