The world of One Piece is filled with powerful individuals fighting for supremacy on the high seas in an attempt to assert their own control. As such, there are different organizations with different goals in mind. Although all these organizations are led by powerful individuals, they often need competent right-hand men to stand by their side and help them when the going gets tough. Over the years, Eiichiro Oda has introduced quite a few powerful right-handers, but only a handful have managed to survive until the final saga, where they have reached unprecedented levels of power.

One Piece: Top 10 Haki Users in All Yonko Teams
The Yonko crews are the strongest on the Grand Line, and they have some of the best haki users in One Piece.
10
Bepo
Bepo is one of the most powerful and competent members of Trafalgar Law's crew. Although he is not above Sachi and Penguin in terms of leadership, Beppo is definitely stronger when it comes to strength. Both Sachi and Penguin recognize this, which is why Eiichiro Oda gives him the same right-hand man treatment.
In a recent battle with the Blackbeard Pirates on Wiener Island, Bepo unleashed his powerful Sulong Form and showed why he is worthy of being one of the most powerful right-hand men in the Final Saga. His current whereabouts are still unknown, but he and Law will return sooner rather than later in the Final Saga.
9
Killer
Killer is Eustass Kid's right-hand man and an incredibly powerful individual who has immense strength at his disposal. His overall level is such that he was even included among the worst generation.
Killer also fought the likes of Yonko in the Wano Country Arc, but in the final saga he was totally decimated by red-headed Shanks with a blow that wasn't even aimed at him. Overall, Killer is certainly one of the weakest right-hand men in One Piece, but still strong compared to the average pirate in the New World.
8
King
King is one of Yonko Kaido's three right-hand men, whom he also calls his “Catastrophes”, and stands as the strongest among them. He is also the very first individual to join Kaido on his journey after being freed from Punk Hazard.
King is a Lunarian with immense powers, and on top of that he has the powers of the ancient Zoan Ryu Ryu no Mi, Model: Pteranodon. Using these powers, King becomes an incredibly convincing pirate with a bounty of 1.390 billion berries on his head. King dedicated his life to seeing Kaido become the Pirate King as well as the next Joy Boy, but in the end all his dreams came crashing down when he met Roronoa Zoro in the Wano Country Arc.
7
Shiryu
Shiryu is considered by Oda to be the second most trusted member of the Blackbeard Pirates. He also possesses immense strength, thanks to the power of the Suke Suke no Mi that he ate quite recently.
Before joining the Blackbeard Pirates, Shiryu was the jailer of Impel Down, imprisoned by Magellan for acts of brutality he committed with his sword Raiu. Shiryu is incredibly powerful, and as Eiichiro Oda shifts focus to the Blackbeard Pirates, his overall character arc will be explored much more.

One Piece: 32 Strongest Swordsmen, Ranked
Given its fierce setting, it's little surprise that talented swordsmen populate One Piece. Here are the strongest of the lot.
6
Roronoa Zoro
Zoro is one of Pirate King Luffy's two Wings, equal to Sanji. He is Luffy's official right-hand man, acknowledged by Oda himself, despite not being the vice-captain of the crew. Zoro possesses incredible strength and has at his disposal the ability to use all three types of Haki, as well as the skills of a master swordsman. He aims to surpass Dracule Mihawk and become the world's strongest swordsman.
Zoro's primary goal is to make Luffy the Pirate King, and only after helping his captain fulfill his ambition does he consider himself worthy of fulfilling his own. Zoro's role in the final saga will be quite significant. Fans can't wait to see Oda explore his character as the right winger even more.
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GameRant Quiz
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5
Marco
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Crew: Whitebeard Pirates (former)
Marco is Whitebeard's former right-hand man, also known to be a highly respected and feared individual throughout the world. He served as the first captain of the Whitebeard Pirates, and his strength is comparable to that of the admirals.
At his peak, Marco uses the power of Tori Tori no Mi, Model: Phoenix brilliantly, instantly healing from any damage he's taken. This, combined with his overwhelming Haki, allowed him to fight both King and Queen at the same time.
4
Sabo
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Group: Revolutionary Army
Sabo is the Chief of Staff of the Revolutionary Army and the second in command of the entire group. He serves as the Dragon's right-hand man and is incredibly powerful, so much so that he can even stand up to Navy Admiral Fujitora without much effort. Sabo possesses immense strength as well as fame throughout the world. His position is actually comparable to Yonko now, labeled as Flame Emperor.
So far, Sabo has shown use of two types of Haki, but it wouldn't be a surprise to see him use Conqueror's Haki as well in the Final Saga. He also has the power of Mera Mera no Mi, which is Ace's devil fruit, which allows for manipulation as well as transformation into flames.
3
Ben Beckman
Ben Beckman is the official vice-captain of the Red Hair Pirates and one of the most fearsome individuals on the seas, whose presence can terrify even a Navy admiral. According to Eiichiro Oda, Ben Beckman is the opposite of Shanks and is often calmer and more composed. Shank's worst impulses are sometimes tempered by Beckman, showing his immense role within the crew.
Ben Beckman possesses tremendous strength, and according to the official 4 Billions volume, his Haki is even greater than Navy Admirals, showing how much of a talented fighter he is.
2
Dracule Mihawk
Dracule Mihawk was a member of the Shichibukai until recently, but now he has moved to the Cross Guild, where he serves under Yonko Buggy. Of all Buggy's minions, Mihawk is the strongest, making him one of the most powerful right-hand men in the world of One Piece.
Mihawk has a bounty of 3,590,000,000 berries, and this number alone shows immense strength. The fact that his bounty rivals the Yonko of the One Piece world is proof enough that he stands among the strongest and elite fighters.
1
Silver's Rayleigh
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Crew: Roger Pirates (formerly)
Of all the right men in the world of One Piecethe one that stands at the very top right now is Silver's Rayleigh. Even in his prime, Rayleigh was an absolute monster, drawing comparisons to Whitebeard in terms of strength. Also, in the Elbaf Arc of One Piece, Eiichiro Oda confirmed that Rayleigh and Scopper Gaban were both on the same level as Roger, with only minor differences in power.
In his prime, Silver Rayleigh was far stronger than most Yonko and a figure that even the fleet wouldn't dare approach. Handling all three types of Haki with immense skill, Rayleigh was quite easily the strongest right-hand man in One Piece.
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