User blog comment:Staw-Hat Luffy/The other guy/@comment-79.179.193.189-20130125220820/@comment-1595565-20130125223941

It couldn't be one of Kaido's beasts, because if it were a Devil Fruit, the user couldn't transform in water. I'd like to think that Caesar's artificial fruits don't break too many rules of Devil Fruit law, but you never know. It does look like a duckboat though.