There are two ways a person can gain power One piece. The first is obtaining the devil fruit and the second is honing their Haki to the point where nothing can stand against their power. There are strong individuals who have these two powers and have conquered everything the world has thrown at them. Some of these individuals have so much power that even without their Devil Fruit, they are strong enough to take down anyone in front of them.

One Piece: Top 10 Haki Users in All Yonko Crews
Yonko crews are the strongest on the Grand Line and have some of the best haki users in One Piece.
7
Whitebeard
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Devil Fruit: Yes
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Haki: Yes
Whitebeard needs no introduction as he once held the title of World's Strongest Man. He possesses all three types of Haki and could use advanced weaponry and Conqueror's Haki at the highest level. This made him rival Roger, Garp and Rocks in strength. Additionally, his Haki grew even stronger when it reached its peak when the Rocks Pirates disbanded.
6
Boa Hancock
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Devil Fruit: Yes
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Haki: Yes
Hancock is one of the few female characters who ranks among the strongest characters in the series. She is the captain of the Kuja Pirates and is a phenomenal Haki user. Her power earned her a place in the Shichibukai, where her reputation reached new heights. Hancock is one of the few characters to have all three types of Haki. With him, she was able to single-handedly defeat the members of the Blackbeard Pirates.

One Piece: 8 Pirate Crews with the Best Haki, Ranked
Haki is an essential tool for survival in the New World of One Piece, and some pirate crews are masters of this power.
5
Kaido
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Devil Fruit: Yes
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Haki: Yes
When it comes to brute force, all fans always think of Kaido. He left an impression that is hard to forget. Much of Kaido's power comes from his Haki, which he has honed over many years of battle. He has all three types of advanced Haki forms, making him superior to most pirates in the series. With it, he easily defeated Luffy and the members of the worst generation.
4
Monkey D. Luffy
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Devil Fruit: Yes
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Haki: Yes
Luffy initially relied heavily on his Devil Fruit in battle situations. But after the timeskip, he learned to use Haki, which increased his abilities while reducing his reliance on his Devil Fruit to win every battle. Luffy has mastered all forms of Haki, an impressive feat. This allowed him to defeat Kaido in their titanic battle atop Onigashima. Even without his fruit, he can defeat the vast majority of individuals in One Piece.

One Piece: 8 Strongest Characters of All Time
These characters defined their generations and stood out as the strongest.
3
Shiki
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Devil Fruit: Yes
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Haki: Yes
Shiki is often overlooked when it comes to strength, as seen in his appearance in Strong World where he was defeated by Luffy some time ago. But tradition says otherwise, for he rivaled Roger and Whitebeard in strength. He fought Garp and Sengoku alone without any help, destroying half of Marineford. His actions paint him as a legend of an old era and a monster who stood right next to the most powerful pirates of his time.
2
King
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Devil Fruit: Yes
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Haki: Yes
King was the first member of the Beasts Pirates and was a powerful commander who gave Zoro a tough fight. He owns a great Devil Fruit called Ryu Ryu no Mi, Model: Pteranodon, but he doesn't rely on it that much. During his fight against Zoro, he used his pure swordsmanship skills and his insane durability to make it difficult for Zoro to defeat him. He is a truly phenomenal fighter who can easily thrive in the world without his Devil Fruit.
1
Big Mom
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Devil Fruit: Yes
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Haki: Yes
From a young age, Big Mom was considered a monster who had the potential to become a fleet admiral. Her strength and endurance allowed her to destroy several giants during her rampage at the age of 6. This was all before she got her devil fruit. When she was at her best, she had raw power that surpassed Luffy's fourth gear and was equal to Kaido, standing on par with him for three days in a row. Even if she didn't have her Devil Fruit, her Conqueror Haki, and her insane durability that acts like an iron balloon, she would make sure to defeat any other doe that dares to challenge her.
- Release date
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October 20, 1999
- Network
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Fuji TV
- directors
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Hiroaki Miyamoto, Konosuke Uda, Junji Shimizu, Satoshi Itō, Munehisa Sakai, Katsumi Tokoro, Yutaka Nakajima, Yoshihiro Ueda, Kenichi Takeshita, Yoko Ikeda, Ryota Nakamura, Hiroyuki Kakudou, Takahiro Imayomura, Yashiôhiro Mayuū Shishido, Hidehiko Kadota, Sumio Watanabe, Harume Kosaka, Yasuhiro Tanabe, Yukihiko Nakao, Keisuke Onishi, Junichi Fujise, Hiroyuki Satou
- Writers
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Jin Tanaka, Akiko Inoue, Junki Takegami, Shinzo Fujita, Shouji Yonemura, Yoshiyuki Suga, Atsuhiro Tomioka, Hirohiko Uesaka, Michiru Shimada, Isao Murayama, Takuya Masumoto, Yoichi Takahashi, Momoka Toyoda
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Mayumi Tanaka
Monkey D. Luffy (voice)
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Kazuya Nakai
Roronoa Zoro (voice)