Sometime within the last four years, Caesar developed a method to create artificial Zoan Devil Fruits with a special chemical known as SAD. He and his captain Donquixote Doflamingo mass-produced these fruits in a factory on Dressrosa and sold these fruits to Kaidou of the Four Emperors in exchange for weapons.
On the day of the God Valley Incident 38 years ago at God Valley, Charlotte Linlin gave this fruit to Kaidou, who at the time was her crewmate on the Rocks Pirates.
This fruit is a Mythical Zoan and it allows Kaido to transform into an Azure Dragon at will.
The give the user the properties of rubber, smoothness, and poison, all which are natural things. However, many fruits exist that give the user properties that can only be found in man-made constructs. A fruit that turns the user into blades, and one that the user can turn into anything so long as it's a weapon.
According to Big Mom, Kaido will always be in debt to her. Thirty-eight years ago, she gave him a very powerful Devil Fruit. Since then, he has put it to great use in the One Piece series.
Kaidou is a middle-aged man who cuts an imposing figure due to his extreme height of 710 cm and the bulk of his muscles, making him dwarf normal humans.
One Piece finally answers a question that has been splitting its fanbase for a long time, by giving proof that the powerful former Yonko, Kaido of the Beasts, never actually awakened his Devil Fruit.
Logia. The rarest and most powerful of the three Devil Fruit types, Logia-type Devil Fruits allow their users to create, control, and transform their body into a natural element, such as smoke, sand, fire, lightning, ice, light, magma, mud, snow, plants and even darkness.
Yes, two people could have the same devil fruit.
These animal attributes are almost always permanent. Also, the abilities granted by SMILEs are noticeably weaker compared to real Zoan fruits. Out of all the SMILE fruits created, only 10 percent of them successfully grant Zoan abilities to the consumer.
The Gomu Gomu no Mi which is also referred to as “Hito Hito Model: Nika” It is a Mythical Zoan-type Devil Fruit that enables the user's body to stretch, making the user a rubber Human (ゴム人間 Gomu Ningen). "Gomu" means "Gum" in Japanese. In the Viz Manga, 4Kids and FUNimation dubs, it is called the gum-gum Fruit.
It's important to note that Yamato and Kaidō's horns are, in fact, parts of their bodies. A possible explanation would be that the two simply wear headpieces that look like horns, which means they're still, technically, ordinary humans.
Throughout the series, One Piece is yet to show his human-beast form. But at the end of Chapter 1003, Kaido finally transforms into his half-man, half-beast form.
His durability stems from the power of the Uo Uo no Mi, Model: Seiryu, a Mythical Zoan-type Devil Fruit that gives him the ability to turn into an eastern dragon. Kaido's scales are extremely tough due to his Devil Fruit powers, yet it isn't as if he can't be beaten.
Kaido started off as human as anyone before he stumbled upon the mother of all Mythical Zoan fruits. According to the magazine report, Kaido was a regular person who gained the ability to transform into a dragon after he ate a Mythical Zoan fruit.
During the God Valley incident, Big Mom gave Kaido his Mythical Zoan Devil Fruit. The fruit allows Kaido to freely transform into a powerful azure dragon. He can also use elemental powers like fiery blasts and even cause massive tornadoes.
It's not just a loss of muscle memory; entering a body of water saps them of all energy. Even entering a bath can drain a Devil Fruit eater of energy and prevent them from using their abilities. Notably, it does need to be a body of water.
Also, a person can only have one devil fruit powers. The concept is that once a devil's spirit is already within a person, it will not welcome another devil spirit. There would be an internal conflict so to speak and the person who consumed two devil fruits would inevitably die.
The Mizu Mizu no Mi is a Logia-type Devil Fruit that allows the user to become, create, and control water.
The Uo Uo no Mi, Model: Seiryu is quite easily the strongest Zoan Devil Fruit in the story so far. It was eaten by none other than Kaido, one of the Four Emperors, following the major battle on God Valley, 38 years ago. This Devil Fruit grants him the ability to turn into an eastern dragon and its hybrid at will.
1/10 Weakest: Beri Beri no Mi
This Fruit is extremely weak and it has some major drawbacks. As seen at Enies Lobby, if the user's head is caught by their opponent, they are basically done for. Furthermore, it isn't immune to sharp objects, which makes swordsmen one of their greatest foes.
The Ougon Ougon no Mi (ougon being the Japanese name for gold) is a Logia Devil Fruit that allows the user to turn into and control gold.
It was because 90% of the eaters ended up smiling and laughing for the rest of their lives that Doflamingo, Caesar, and Kaidou named the fruit SMILE, cruelly mocking their misfortune.
According to him, the best way to stand on top of the world is Haki, another mysterious power in the series, born not from desire but from willpower. This means that Kaido's reliance on Haki made him less inclined to fully master his Devil Fruit abilities, including the awakening.
Zoro and Sanji's Fruits aren't as directly connected to their characters. Zoro would receive Kaido's Mythical Fish Fish Fruit, which enables its user to turn into a dragon and Sanji would receive the Swim Swim Fruit, which enables its user to swim through solid surfaces like the ground.