Gear 5 is the ultimate transformation of Luffy in One Piece that has proven to be exceptionally overpowered. Luffy attained this transformation after being knocked into a near-death state by Kaido. His Devil Fruit ended up awakening, and he gained this all-white transformation, which strengthens his body greatly and also gives him more freedom as well as the ability to pull off impossible things, as long as he can imagine them.
It is quite clear that Gear 5 is one of the strongest transformations in the entirety of One Piece. However, there are a few others that can certainly rival it to a degree. While the vast majority of these transformations cannot best Gear 5, they are still impressive enough to hold their own against Luffy, at least for a while.
Big Mom is one of the former Four Emperors of the Sea and an exceptionally powerful pirate. In her life as a pirate, she had attained a bounty of 4.388 billion berries, which just goes to show that she was among the elite. Big Mom had several abilities up her sleeve, and one of them was the ability to grow tremendously in strength and size by consuming her own lifespan.
She took this transformation on during her fight against Kid and Law and went on to largely dominate this battle. This increased her strength as well as durability and endurance to a great degree. Even a barrage of powerful attacks that dealt internal damage could not put her down. In fact, Kid and Law were not able to knock her out at all. The best they could do was throw her off Onigashima, and Big Mom then signed her own downfall by accidentally making some incredibly powerful bombs land on herself.
Kaido has several powerful transformations in his locker, and while his standard hybrid form is powerful enough to rival Gear 5 on its own, he has even stronger forms under his belt. One of them is the Bloodthirsty Drunk state that he attains after entering his Shuron Hakke state. By consuming a large amount of alcohol, it appears that Kaido can up his strength even more.
He gains access to unique transformations that are quite similar to Devil Fruit Awakening themselves and might even be classified as such. One specific transformation sees him gain a much bigger body and a more of an animalistic appearance, with a bulbous nose, sharper teeth, and bigger arms, among other things. His physical attributes are boosted to a sky-high level when he takes this form, and his attacks become even more powerful than ever before. Kaido also takes on a purple hue when he takes this transformation.
Kaen Daiko, also known as Flame Dragon Torch, is the strongest transformation that Kaido has under his belt. This form sees him transform into a massive dragon that can engulf an entire island with ease. This dragon is made out of pure magma-like, and the tremendous heat that this dragon possesses is enough to vaporize an island by merely passing over it.
Quite clearly, the strength that this dragon possesses is tremendous, and even a single hit from it would be lethal. Kaido used this transformation in his fight against Luffy at the very end. Unfortunately for him, Luffy knew how to damage his enemies without making contact with them. By using Ryuo, Luffy could freely channel the power of his Bajrang Gun and utterly demolished Kaido.
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