User blog comment:Blackendedsoul/Kaido's devil fruit/@comment-24769684-20160119115048

Dragon is my best bet, given the scales on his chest. It would also explain how he got up to the sky island. I agree with Vid, I don't think he actually wants to commit suicide or at least do it in a pitiful way, Kaido is a creature who craves excitement. So if he ever inadvertently fell into the water he would probably fly up before he landed in it