Gol D. Roger was called the Pirate King. But sadly he did not have a Devil Fruit power. From what we have seen from flashbacks, Roger solely relied on his Haki in battle.
Roger possessed immense physical strength. He could also clash evenly with Edward Newgate, the Strongest Man in the World, matching him in strength. Roger possessed immense endurance and vitality even when he was ravaged by an incurable disease.
Zoro set out on his journey to becoming the greatest swordsman in the world by defeating Dracule Mihawk, the man who currently sits on the stone. Over the years, he has come a long way and become one of the strongest pirates on the seas. Zoro has attained terrific strength, but he does not rely on a Devil Fruit at all.
Roger got his powers by training and developing his haki to the highest level, along with his monstrous physical abilities. That's why he was able to stand at the top of the pirate world, despite not being a devil fruit user.
By becoming the King of the Pirates, he was essentially immortalized. Not only did Roger have a tremendous pedigree but he also possessed incredible strength that stemmed from his Haki. Only a handful of other One Piece characters can compare to his power, and even fewer could prove a match for him in battle.
It is evident that the only person capable of surpassing Roger is Luffy. Even though Luffy still has a lot to achieve, he is the only person who can transform the entire world.
As a Devil Fruit that has shown no clear weakness, the Magu Magu no Mi is perhaps one of the strongest.
1 Gol D.
Roger is the strongest One Piece character and the only people who could match up to him in strength were Garp and Whitebeard. Roger possessed all three Haki and could use advanced forms of both Armament and Conqueror's Haki.
Blackbeard is the only character in One Piece with two Devil Fruits. How did he do it? Marshall D. Teach, better known by his epithet, is arguably the most dangerous living pirate in One Piece.
The circumstances surrounding Zoro's left eye aren't a complete mystery; at the very least fans know that it happened sometime during the two-year time skip. During this time, each member of the Straw Hat crew committed to training and growing stronger.
It's entirely possible Mihawk noticed through their duel and training that Zoro suffers from ocular dominance in his left eye. That is to say, the left eye is stronger than the right. As a result, maybe Mihawk scarred the left eye shut and instructed Zoro not to open it until his right eye was trained enough.
Mythical Zoans are the rarest type of Devil Fruit, even more so than Logias. Artificial - Artificially created Zoan Fruits that cause the user to permanently take on an animal characteristic; though, much more rarely, the user becomes able to transform at will.
Roger's first and perhaps his most formidable rival and greatest enemy was Rocks D. Xebec, the captain of the legendary Rocks Pirates who sought to become the king of the world.
Mihawk's strength is so great that Don Krieg accuses him of having the power of a Devil Fruit. While it has not yet been officially confirmed that he does not, it has only been indicated that his abilities are from pure skill and power.
When it comes to quickness, not many anime characters can match Kizaru. He is by far the fastest character in One Piece, and it is mainly due to his devil fruit. Kizaru possesses the Pika Pika no Mi, a Logia-type devil fruit, and it allows him to control light at will.
The Gura Gura no Mi is considered the strongest Paramecia devil fruit of all for its absolute destructive powers. Whitebeard earned the title of the “Strongest man in the world” with this devil fruit.
The Soku Soku no Mi is a Paramecia-Type Devil Fruit that enables the user the ability to move at extreme speeds, thus making the user a Fast Human (速い人間 Hayai Ningen).
Roger used advanced forms of conqueror's haki as he imbued his sword with conqueror's haki and clashed with Whitebeard. He also used advanced armament haki for more powerful sword attacks. Additionally, Roger possessed the observation haki, thus, making him the strongest haki user of all time in One Piece.