It took more than a year, but One Piece fans were finally able to see Luffy's Gear 5 transformation in anime form. Unlike Luffy's other forms, Gear 5 is a direct result of Devil Fruit awakening, which means that he can now fight without limitations. Gear 5 is considered to be the most ridiculous powers in the world, and it is a tad broken because it allows Luffy to turn anything into rubber. That being said, there are a few Devil Fruits that are capable of beating Gear 5.
Most of these Devil Fruits are Paramecia, which makes sense since Paramecia users can have all sorts of superhuman abilities. Luffy can land hits on Logia users because he can use advanced Haki, but there are certain Logia powers that can make Gear 5 meaningless.
11 The Sand-Sand Fruit
User: Crocodile
Crocodile is a former Warlord who ate the Sand-Sand Fruit – a Logia which allows him to create and transform into sand. Like other Logia users, most physical attacks would phase through his body. Liquid causes sand to harden, and Luffy used water and blood to counter Crocodile before he could use Haki.
The scariest aspect of Crocodile's Devil Fruit is the fact that he can absorb all the moisture out of an object by grabbing it. He used this ability on Luffy, and the Straw Hat captain would have died in a mummified state if he had not received water. Even if Luffy is using Gear 5, Crocodile should still be able to render the transformation useless if he can mummify Luffy's body.
10 The Hobby-Hobby Fruit
User: Sugar
Sugar is a member of the Donquixote Pirates, and she was an integral part of Doflamingo's operation. She ate the Hobby-Hobby Fruit, a Paramecia which gives her the ability to turn anyone she touches into a living toy. This Devil Fruit also stops the aging process, which is why she looks like a 10-year-old.
Luffy can theoretically be transformed into a toy while using Gear 5, and if Sugar is able to form a contract with him, he will be forced to obey all of her orders. The only way Luffy would be able to return to normal is if Sugar is knocked unconscious.
9 The Op-Op Fruit
User: Trafalgar D. Water Law
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Luffy and Trafalgar D. Water Law were allies for quite some time, but if they were to fight for real, there is a good chance that Law would be able to stop Gear 5. Law has the power of the Op-Op Fruit, which gives him the ability to manipulate the fabric of space within a designated spherical area.
Even if Luffy uses Gear 5, Law can use his power to split Luffy's body into dozens of pieces with multiple sword slashes. Best of all, those slashes can split someone without even making physical contact. If this happens, Luffy would not be able to move anymore.
7 The Spike-Spike Fruit
User: Zala
As Kaido mentioned during their fight, cutting attacks can still injure Luffy's Gear 5 body. Zala was the second strongest female officer agent of the Baroque Works criminal syndicate, and she ate a Paramecia known as the Spike-Spike Fruit.
As its name would suggest, it allows her to grow spikes from any part of her body. These spikes are strong and incredibly pointy, and Zala primarily uses them to stab her opponents. If this power belonged to someone stronger, they can pierce straight through Luffy's body. The spikes are a great defensive tool as well because they can intercept punches and kicks.
6 The Snip-Snip Fruit
User: Inazuma
Inazuma is a deputy commander in the Revolutionary Army, and he serves as Emporio Ivankov's right hand man. He ate the Snip-Snip Fruit, a Paramecia which gives him the ability to transform parts of his body into scissors. He can use this power to cut through anything as if it were made of paper.
The Snip-Snip Fruit also allows him to freely manipulate anything he cuts. Inazuma can use his scissors to cut through Luffy's rubber body. The only way Gear 5 Luffy can technically stop this is if he grabs the scissors before they can cut him.
5 Jewelry Bonney's Unnamed Devil Fruit
Jewelry Bonney is the only female member of the Worst Generation, and she ate a currently unnamed Paramecia Devil Fruit that allows her to freely manipulate the aging process. She can cause herself to rapidly age or de-age herself, but she can do it to others as well.
While on Egghead Island, she used this power to make Luffy 70-years-old. In doing so, she made him too weak to move. Gear 5 takes a huge toll on Luffy's body, so he may not be able to withstand the strain if he is too old. The same issue would arise if Bonney turned him into a toddler.
4 The Book-Book Fruit
User: Charlotte Mont-d'Or
Charlotte Mont-d'Or is the 30th child of Charlotte Linlin, and he serves as Totto Land's Minister of Cheese. He ate the Book-Book Fruit, a unique Paramecia which gives him the ability to manipulate books. This may not sound like an impressive power, but he used it to trap both Luffy and Nami.
Mont-d'Or can theoretically trap Luffy in another book while he is using Gear 5, and he would not be able to escape. Even if Luffy managed to turn the book into rubber, Mont-d'Or would still be able to control it.
3 The Paw-Paw Fruit
User: Bartholomew Kuma
Bartholomew Kuma is a Revolutionary who agreed to become a Warlord and Pacifista, and he ate a Paramecia known as the Paw-Paw Fruit. It gave him paw pads on the palms of his hands, and these pads give him the power to repel anything they come into contact with.
This is a very strong defensive power that even Gear 5 cannot counter. If any of Luffy's attacks get close, the paw pads will repel them all away. Luffy would not even be able to turn Kuma's body into rubber because his hands will never be able to reach him.
2 The Dice-Dice Fruit
User: Daz Bonez
Daz Bonez was Baroque Works' highest ranked male officer agent, and he can literally slice Gear 5 Luffy to pieces. He ate the Dice-Dice Fruit, which gives him the ability to turn any part of his body into a sharp steel blade. This fruit is especially deadly in Daz's hands because he is a gifted martial artist.
Daz can cut through stone as if it were butter, and since his body is basically made of steel, he is almost immune to damage. Since cutting attacks can harm Luffy's Gear 5 body, this Devil Fruit is the perfect melee counter.
1 The Dark-Dark Fruit
User: Marshall D. Teach
The Dark-Dark Fruit is a Logia that was eaten by Marshall D. Teach, and it allows him to create and manipulate darkness. Unlike other Logia users, Teach's body is not intangible, in fact physical attacks deal more damage to him. This means that Gear 5 Luffy can land powerful hits, but doing so could prove deadly.
Thanks to the Dark-Dark Fruit, Teach can nullify other Devil Fruit powers by making physical contact with the user. Even if Luffy used Gear 5 against him, Teach can cancel the transformation at any time.
