
During the Elbaph arc of One Piece, the author, Oda, really started to showcase a dangerous group called the Knights of God, or Holy Knights. I think one of them, Saint Sommers, would be an amazing opponent for Zoro. Sommers is basically the Holy Land of Marijoa’s top assassin, and interestingly, like Zoro, he’s a master swordsman with a very powerful blade. As a Holy Knight, he has a special connection – the Depths Covenant – with Saint Imu, which gives him incredible abilities. This covenant not only allows him to regenerate and essentially be immortal, but also grants him superhuman strength that could go toe-to-toe with some of the strongest fighters in the One Piece world.