The Straw Hat Pirates have grown tremendously in power over the years. From humble beginnings in East Blue, Luffy's crew is now a Yonko force that could take on most threats One piece world. In this mighty crew, Sanji stands tall as one of the most overpowered fighters. While his main role is to cook, he is also an incredible fighter on par with Roronoa Zoro.
Sanji is already above Yonko Commander level, and while he is on his way to naturally reaching Yonko level, some devil fruit would get him to that rank almost instantly. Not only could certain fruits give him new and advanced elemental powers, but they fit his personality perfectly so it doesn't feel out of place.

One Piece: The Devil Fruits of Every Top-Tier Pirate, Ranking
These top level pirates are powerful and have some of the strongest Devil Fruits in One Piece.
7
Pika Pika no Mi
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Current user: Kizaru
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Type: Logia
Pika Pika no Mi is one of the flashiest Devil Fruits One piece story. This Logia-type Devil Fruit is currently wielded by Admiral Kizaru, allowing him to both become and produce light.
Pika Pika no Mi is undoubtedly one of the best Devil Fruits Sanji has gotten his hands on. Sanji is one of the fastest One piece characters and this fruit would give him an even greater speed boost, allowing him to move at the speed of light. This logic would also increase his attack power as it would apply light based powers to his kicks.
6
Mera Mera no Mi
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Current user: Sabo
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Type: Logia
Mera Mera no Mi was formerly Portgas D. Ace's devil fruit. Today it is owned by Sabo, who acquired it during the Dressrosa arc. This fruit was one of the very first types of Logia introduced in the story, and its powers allow the user to transform and produce fire themselves.
The reasons why this fruit would be perfect for Sanji and elevate him to Yonka level are clear. Sanji is already a character that uses fire through power-ups like Diable and Ifrit Jambe. The ability to become fire itself would allow more versatility with these attacks and potentially make it easier to burn in a hotter way without taking damage. Logia's intangibility alone would also be a great power boost.
5
Kira Kira no Mi
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Current user: Jozu
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Type: Paramecia
Kira Kira no Mi is a Paramecia-type Devil Fruit possessed by former Whitebeard Pirates crew member Jozu. This fruit allows Jozu to transform into a diamond and would be the perfect addition to Sanji's arsenal, making him stronger than ever before.
Transforming into a diamond would expand Sanji's versatility. Currently, Sanji is extremely durable, especially since he unlocked his exoskeleton in Wano versus Queen. With Kira Kira no Mi, this resistance would increase many times over. Kira Kira no Mi's resistance would even allow Sanji to sustain and sustain hotter flames than he currently has, ensuring that he surpasses Ifrit Jambe. Additionally, his attacks would hit even harder.

One Piece: All 5 users Hito Hito no Mi, rated
Hito Hito no mi is a devil fruit with many variations and there are quite a few famous users of this category in One Piece.
4
Tori Tori no Mi, Model: Phoenix
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Current user: Marco
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Type: Mythical Zoan
One of the greatest mythical Zoan Devil Fruits, the Tori Tori no Mi, Model: Phoenix, was first introduced during the Summit War when Marco, Whitebeard's right-hand man, used it with great mastery against the Navy.
What makes this fruit as special as it is is its insane regenerative power. Since this allows Marco to transform into a phoenix, he can instantly heal from any damage. Marc's blue flames of resurrection are incredibly versatile both as support and offensive attacks. The Phoenix Fruit even provides superior mobility with flight, which could prove to be even better than Sanji's Sky Walk.
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3
Goro Goro no Mi
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Current user: Enel
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Type: Logia
Goro Goro no Mi, also known as Rumble Devil Fruit, is a Logia type that grants its user the power of lightning. As with all Logias, it also comes with intangibility, making it nearly invincible against all non-Haki users. At this moment, this Devil Fruit is in the possession of God Enel.
Goro Goro no Mi is one of the best Logia options for Sanji. Since it is based on lightning, it increases the speed of its user and allows for faster travel. The lightning attack from this fruit would also sync up amazingly with Sanji's kick style combat. The secret power of this Devil Fruit, which would make Sanji Yonko level up, comes from its support of Haki Observation. By creating an electromagnetic field, Sanji could almost instantly become the best Observation Haki user in the entire story.
2
Hi Hi no Mi
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Current user: Kuzan
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Type: Logia
Hie Hie no Mi is another Logia Devil Fruit that was introduced by one of the naval admirals, Kuzan, also known as Aokiji. This type of Logia gives him the ability to create and transform into ice.
While Sanji's associated element is fire as seen in two attacks such as Diable Jambe and now Ifirit Jambe, this Devil Fruit could give him more versatility in terms of the elements he can use to attack. Instead of getting another fire or heat based devil fruit, tapping an ice fruit would make Sanji a dual element owner. Sanji was able to split both fire and ice attacks. His arsenal would expand greatly and he could even combine the two elements into one.
1
Mero Mero No Mi
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Current User: Boa Hancock, S-Snake
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Type: Paramecia
Mero Mero no Mi is a fruit that falls under the Paramecia category. Its current user is Pirate Empress Boa Hancock, a major ally of Luffy and the Straw Pirates. Hancock is the ideal user of this fruit. Using her beauty, she has the potential to one-shot even the strongest characters around.
However, this fruit would also be good for the Slamák cook. Sanji would be able to use petrification abilities with kick based abilities with this fruit, just like Hancock does with Perfume Femur. He would only need to perform his usual kicking attacks to petrify most enemies. Sanji and Hancock's similar fighting styles already show how this devil fruit could work in a chef's possession. That being said, fans should also not underestimate Sanji's charm, which would only be boosted by this Devil Fruit's abilities, as well as the irresistible beauty of Hancock or the cuteness of S-Snake. It should also be noted that this fruit does not necessarily need positive feelings to work. Since Hancock can also turn into stone inanimate objects like cannonballs or inanimate objects like the Pacifist, he can petrify almost anything, meaning Sanji would make great use of it.
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