Perhaps the image of the `Dragon God` Kaido descending to earth is the most attractive point in the recent One Piece Chapter 921. All social networking sites have been in chaos because of the true appearance of this Four Emperors.
There have been many opinions that Kaido ate the mythical Dragon-type Zoan Devil Fruit, but in my opinion it is not that simple.
If you have noticed, Kaido has never been called a human by the author but only mentioned as a `creature` or `beast`.
He was executed 40 times, but every time they hanged him, the rope broke, put him on the guillotine, the blade broke, stabbed him with a spear, the spear broke, and he also sank at least 9 great battles.
So where does this terrible power come from?
Because of all the above questions, I have a hypothesis that the Four Emperor Kaido was previously captured by the World Government and they performed some experiments on his body.
In particular, their genius scientist Vegapunk once extracted other people’s DNA to create artificial Devil Fruits, so the Government wants to mass-produce the power from `Kaido Dragon`.
This would explain why Kaido’s body is so durable, because he himself is a Dragon so he has a super solid and immortal body.
Further evidence for this hypothesis is that Kaido’s appearance when transformed into a Dragon is very similar to the Dragon `Dragon King` in Chinese mythology – this is a God-level creature capable of transforming into human form.
Perhaps Saint Oda took ideas from this creature to create the character of the Four Emperors Kaido.
Above are all personal opinions of the writer, please read for reference.