Onigashima as an island is massive, especially given the scale of the ornaments Kaido used to decorate the ride to the main castle.
![](https://www.opfanpage.com/wp-content/uploads/2020/04/kz9hlakgb7v41.jpg)
What I really wanted to get at was the massive skull that resides on the island itself.
![](https://www.opfanpage.com/wp-content/uploads/2020/04/8zohjh8ex1v41.jpg)
It seems to have a very distinct appearance, that of the ancient giant race that Oars and Little Oars Jr. are descendants of.
![](https://www.opfanpage.com/wp-content/uploads/2020/04/Oars_Compared_to_Giants_and_Humans.png)
This made me think that Kaido could be from the same race as Oars the Continent-Puller and Little Oars Jr.
![](https://www.opfanpage.com/wp-content/uploads/2020/04/Little_Oars_Jr._Anime_Infobox-861x1024.png)
As you see from these 3 images, the design of the horns of all these 3 characters is the exact same, so I’m sure Kaido is probably a half descendant of whatever race Oars and Little Oars Jr belonged to.
What do you think?
Theory by Starmie21