Kaido

Kaido, also known as Kaido of the Hundred Beasts (百獣のカイドウ), is one of the Yonko, and the third to be mentioned by name. Kaido's name is first mentioned by Gekko Moriah shortly after having obtained Luffy's shadow. His title was revealed just after the Straw Hats defeated Moriah.

Personality
From what is shown, Kaido is a merciless warrior who would not let an opportunity slip by, as he planned to attack Whitebeard during the latter's attempt to save Portgas D. Ace from execution. He is also pitiless and is not open to negotiations and excuses, which makes it seemingly unwise to provoke or underestimate him. This is especially enforced that Donquixote Doflamingo, a Shichibukai known for his fearless and confident attitude, shows fear of being killed by Kaido when he may be unable to fulfill his end of their alliance due to Trafalgar Law holding Caesar Clown as a hostage.

It was also stated by Scotch that Kaido has a favorite island, a winter island that was guarded by the cyborg and visited by X Drake.

Donquixote Doflamingo
Kaido has a business agreement with Donquixote Doflamingo. Doflamingo, through the help of Caesar Clown, produces large amounts of Caesar's SAD substance in order for Kaido to create an army of Artificial Zoan Devil Fruit users. However, in spite of this they do not seem to be on friendly terms, as Law asserted that Kaido will slaughter Doflamingo if he cannot supply Kaido with Zoan fruits anymore.

Gekko Moriah
Kaido once had a rivalry with former Shichibukai Gekko Moriah. The two of them fought in the New World. Eventually, Kaido won and apparently slaughtered Moriah's entire crew. This had an adverse effect on Moriah's perception on subordinates, and led him to seek revenge against Kaido by building his own army of undead soldiers.

Edward Newgate
As both are one of the Yonko, Kaido and Edward Newgate are not allies, yet would not, under normal circumstances, provoke each other. However, Kaido saw the opportunity to take down his rival during the impending Battle of Marineford, and did not hesitate to take advantage to attempt so.

X Drake
X Drake attacked one of Kaido's territories, his favorite Winter island. It is unknown if Drake did so to provoke the Yonko or to take over the island for himself without fearing retributions.

Trafalgar Law
Trafalgar Law intends to dethrone Kaido, but apparently is not confident enough to attempt it by himself. To accomplish this, Law sought out an alliance with Monkey D. Luffy and the Straw Hat Pirates, to which they agree, with Luffy even declaring that he will defeat all four Yonko. Law suggested that even with this alliance, the chance of success is 30%.

Abilities and Powers
As one of the Yonko, Kaido is one of the strongest pirates in the world. He attempted to take Whitebeard's life, which is something that few would dare, and clashed with Shanks. He also once fought against Gekko Moriah of the Shichibukai, and emerged victorious. Being a Yonko in and of itself is a testament to his power. It was also stated by the Gorosei that he is one of the few people capable of stopping Blackbeard.

According to Law, he is said to be the most powerful creature in the world, implying that he is not even human.

Similar to Whitebeard, Kaido also seems to have many underlings and allied pirates, and is able to claim islands as his own territories. With Caesar and Doflamingo as his allies, Kaido has created an incredibly large and powerful army of Artificial Zoan-class Devil Fruit users.

Past
At one point in his life, he fought with Gekko Moriah and defeated him in the New World. Though the details of the battle have yet to be fully explained, it is implied that he is responsible for the death of Moriah's original crew. He eventually teamed up with the Shichibukai Donquixote Doflamingo and rogue Marine scientist Caesar Clown to create an army of artificial Zoan Devil Fruit users.

Whitebeard War
When Whitebeard attempted to save Ace from his execution at Marineford, Kaido tried to attack him. However, Shanks intercepted Kaido before he could reach Whitebeard, and Kaido either retreated or was defeated, as Shanks managed to arrive at Marineford at the end of the war.

Post-War Arc
After the war, X Drake arrived at an unnamed winter island that happened to be a favorite of Kaido's. When he asked a cyborg henchman, Scotch, guarding the island if attacking him would get Kaido's attention, he was told yes. Upon hearing this, the Supernova used his Devil Fruit abilities to transform into a dinosaur and attacked.

Major Battles

 * Kaido vs. Gekko Moriah's first crew (past battle, unseen)
 * Kaido and his crew vs. Red Hair Pirates (result uncertain)

Translation and Dub Issues
Kaido's epithet, Hyakujū (百獣), literally translates to "Hundred Beasts", but that hundred beasts label is a very common epithet that gets attached to lions in Japanese. The English equivalent of that epithet, even if it is not a literal translation, is "king of the beasts."

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