Kaidou

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
Not much is known about Kaido's personality at the moment, but he appears to be a merciless warrior, planning to attack Whitebeard during the latter's attempt to save Portgas D. Ace from execution.

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 and Caribou.

According to Trafalgar Law, Kaido is the most dangerous creature in the world, which highly suggests Kaido must be quite a pitiless figure and is not to be provoked or underestimated. In fact, when Law kidnapped Caesar Clown and reminded Doflamingo that Kaido would be unhappy and would kill him if he ever found out Doflamingo could not produce SAD for him anymore, it triggered an expression of terror on Doflamingo's face, something never seen before on him in the series.

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.

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.

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.

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.

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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