Kaido of the Beasts is one of the Yonko and the third to be mentioned by name. He is also one of the central antagonists of the Pirate Alliance Saga. According to Trafalgar Law and the manga, Kaido is known as the "strongest creature in the world".
Kaido's name was first mentioned by Gekko Moriah shortly after he obtained Luffy's shadow. His title of Yonko was revealed just after the Straw Hat Pirates defeated Moriah.
Powers and Stats
Tier: Likely 6-B
Name: Kaido, The King of the Beasts
Origin: One Piece
Attack Potency: Likely Country level via power-scaling (Kaido is regarded as the strongest creature in the world, and is feared by the likes of Doflamingo, who preferred fighting with the admirals to Kaido)
Speed: At least Massively Hypersonic by power-scaling
Lifting Strength: Class T
Striking Strength: Likely Country Class by power-scaling
Durability: Likely Country level by power-scaling (Has been captured by both Marines and enemy pirates, including Yonkō, innumerous times, only to survive each time. Spears are incapable of piercing his skin, jumped down 10,000 metres, creating a massive island sized dust cloud upon impact, and merely receiving a mild headache.)
Stamina: Very high via powerscaling, characters weaker then him have fought for several days straight
Standard Equipment: None
Intelligence: Should be quite intelligent as a Yonko (Has to take care of his massive crew)
Weaknesses: Easily gets angry over petty reasons.