I think the end game fights are
V. Nusjuro vs Zoro
Ju Peter vs Sanji
Mars vs Jinbei
Warcury vs Yamato
Saturn vs Franky
V. Nusjuro vs Zoro (V. Nusjuro and Zoro are from Wano, Wano is the Land of Gold, Ethanbaron is the God of Finance. Foreshadowed by Zoro fighting Ryuma, an undead swordsmen from Wano, when V. Nusjuro is an undead swordsmen)
Ju Peter vs Sanji (God of Agriculture, I think the Vinsmokes were once Celestial Dragons that left like Doffy's family. Foreshadowed by Queen turning into a snake/worm)
Mars vs Jinbe (Fish vs Bird, Sky vs Sea. FIshmen have always yearned to live above the surface, Mars is a bird who can fly freely anywhere. Jinbei is a literal fish in a series that's incredibly ocean focused, Mars in the God of Environment, most of the One Piece world's environment is the Ocean)
Warcury vs Yamato (foreshadowed by Oden vs the Mountain God)
Saturn vs the Ancient Robot and Franky (already got a bit of this, I believe Saturn is from Vegapunk's Island, Karakuri, that Franky studied at, and also was responsible for the creation of the Ancient Robot, in the sense he forced a scientist, like Vegapunk, to turn a giant into a robot. Hopefully the Giants recognize the Ancient Robot)
Had Sabo fighting Topman but nah his final fight will be Akainu.
V. Nusjuro vs Zoro
Ju Peter vs Sanji
Mars vs Jinbei
Warcury vs Yamato
Saturn vs Franky
V. Nusjuro vs Zoro (V. Nusjuro and Zoro are from Wano, Wano is the Land of Gold, Ethanbaron is the God of Finance. Foreshadowed by Zoro fighting Ryuma, an undead swordsmen from Wano, when V. Nusjuro is an undead swordsmen)
Ju Peter vs Sanji (God of Agriculture, I think the Vinsmokes were once Celestial Dragons that left like Doffy's family. Foreshadowed by Queen turning into a snake/worm)
Mars vs Jinbe (Fish vs Bird, Sky vs Sea. FIshmen have always yearned to live above the surface, Mars is a bird who can fly freely anywhere. Jinbei is a literal fish in a series that's incredibly ocean focused, Mars in the God of Environment, most of the One Piece world's environment is the Ocean)
Warcury vs Yamato (foreshadowed by Oden vs the Mountain God)
Saturn vs the Ancient Robot and Franky (already got a bit of this, I believe Saturn is from Vegapunk's Island, Karakuri, that Franky studied at, and also was responsible for the creation of the Ancient Robot, in the sense he forced a scientist, like Vegapunk, to turn a giant into a robot. Hopefully the Giants recognize the Ancient Robot)
Had Sabo fighting Topman but nah his final fight will be Akainu.