The devil fruit that Kaido has is a mythical fish-fish fruit, this is why it looks like a dragon. It has been confirmed however that Keiod is in the possession of a fish-fish fruit and not a dragon fruit by Big Mom.
The Uo Uo no Mi, Model: Seiryu is a Mythical Zoan-type Devil Fruit that allows the user to transform into a hybrid and full version of an Azure Dragon at will. It was eaten by Kaidou after it had been given to him by Big Mom during the God Valley Incident.
Kaido's strength is what defines him the most and much of that comes down to his incredible Devil Fruit, the Mythical Zoan type Uo Uo no Mi, Model: Seiryu, or the Fish-Fish Fruit, Model: Azure Dragon.
According to Dr. Vegapunk, Devil Fruits come into existence through imagination or a want for something. Throughout history, there have been countless people who have wished for certain powers to exist. For instance, there have been people who have wished for the power to control fire or the power to control ice.
Artificial Devil Fruits are man-made fruits designed to give consumers special powers like a natural Devil Fruit would. The creation of artificial Devil Fruits has been attempted by two scientists, who once belonged to the research institute MADS: Vegapunk and Caesar Clown.
Mythical Zoans are the rarest type of Devil Fruit, even more so than Logias. Artificial - Artificially created Zoan Fruits that cause the user to permanently take on an animal characteristic; though, much more rarely, the user becomes able to transform at will.
The Kraken is a legendary sea monster of enormous size said to appear off the coasts of Norway. In the Viz manga, the fruit is called Octopus-Octopus Fruit, Mythical Type, Model Kraken.
The Oni are a rather mysterious race as almost nothing is known about them. They haven't been officially introduced in the series yet, but there is no doubt that they will be confirmed as a separate race, sooner rather than later. There are two known members of this race- Kaido and Yamato.
The Hana Hana no Mi is a powerful Paramecia-type of Devil Fruit eaten by Zoro's crewmate, Nico Robin. This Devil Fruit allows the user to sprout any part of their body from anywhere. With advanced control, the user can even create an entire clone of themselves.
As a Devil Fruit that has shown no clear weakness, the Magu Magu no Mi is perhaps one of the strongest.
Alber, better known as King the Conflagration, is an All-Star of the Beasts Pirates and a major antagonist in the Wano Country arc of One Piece. He is one of Kaido's right-hand men, along with Queen and Jack, and is the second highest ranked member within the crew. He is a sole survivor of the Lunarian race.
The Nami Nami no Mi is a Paramecia-type Devil Fruit that allows its user to become a "Tearful Woman" (涙の女, Namida no On'na) as it enables them to change the the properties of their tears.
The circumstances surrounding Zoro's left eye aren't a complete mystery; at the very least fans know that it happened sometime during the two-year time skip. During this time, each member of the Straw Hat crew committed to training and growing stronger.
During Sanji's cooking battle in a Loguetown Arc filler episode, it was mentioned that some fish species that should not exist in the East Blue were found due to ocean currents, which made Sanji certain that the All Blue exists.
Garp Is Considered To Be One Of The Strongest Marines. Also renowned as 'Garp The Hero' and 'Garp The Fist', Monkey D. Garp is a Vice-Admiral of the Marines. Being their strongest known member in history, there's no denying that Garp is capable of taking on Kaido.
Right of Kaidou's defined abs is his only scar: a massive, recessed X-shape whose upper points reach to his pectoral, given to him by Kozuki Oden. Twenty years later, Roronoa Zoro managed to add another scar to Kaidou's chest that runs from the top left point of the first scar to near his left shoulder.
After his death, Yamato chose to become just like Oden, impersonating him and adopting his mannerisms. As a result of this desire to emulate Oden, Yamato decided to become a man and identify as Kaidou's son, and Kaidou and his crew refer to him as such as well.
Joker are Artificial Devil Fruits, manmade fruits designed to give consumers special powers like a natural devil fruits would, specifically of the Paramecia-type. These fruits were originally created by Bryant D. Kobe, an innate scholar from the Cloudia Kingdom, under a different name, but were incomplete failures.
The Ou Ouno Mi, Model: Leviathan is a Mythical Zoan-type Devil Fruit that allows the user to transform into A hybrid and full form of the mythical 7 headed serpent the Leviathan. The user can also decide how many heads come out when transforming into the beast form.
Vast grotesque tentacled creatures who live in the sea, and which are extremely dangerous to anyone or anything that comes too close to them. They are commonly believed to be the female counterparts of the dragons, since no female dragon has ever been seen.
The Atsu Atsu no Mi is an anime-only Paramecia-type Devil Fruit that gives the user the ability to produce and control vast amounts of heat, making them a 10,000 Degree Human (１万度人間, Ichiman Do Ningen?). It was eaten by Don Accino.
The Gura Gura no Mi is considered the strongest Paramecia devil fruit of all for its absolute destructive powers. Whitebeard earned the title of the “Strongest man in the world” with this devil fruit.
Enma is the strongest blade that Zoro owns at the moment. It's one of the 21 Great Grade swords, with the potential to become as strong as one of the twelve Legendary Grade swords. Zoro accepts the challenge and takes Enma, hoping to turn it into a black blade.