Just a different kind of human like Moriah or Oars
A regular animal like Bepo
An animal who eat a new Hito Hito no Mi model
A Kaiju (i.e. Godzilla)
A Vampire, Mummy or other folkloric being
Sry for a bit off-topic
I think kaido is a massive sea creature which allows him to go in the water even though he is df user--which makes him special and dangerous.
I don't think that is possible, since the water directly affects the user, no matter the shape, or wether he is able to breathe underwater, or not. Plus, we had an example of that before: Van der Dekken was a fishman and DF user and he would be able to live in the seawater, but unable to swim, or move.
two things come to mind for me now
1) Kaido is a minkman or human-Minkman hybrid, with a ferocious attitude, extremely powerful haki and skilled in combat.
2) He is a awakened mythic zoan of a Faun or a Centaur hence he has a human face but the body of a creature
kirin the mythical creature
I could see Kaido being a lion to represent king, as lions are kings of the jungle. Likewise, Kaido could be the king of Yonkou or his territories, also showing his might.
For kaido to stand out from his crew he would definitely have to be a mythical creature.
Btw who says kaido has to be a zoan-type just because his crew is mostly zoans?
I know Pekoms is a lion. Just figured Kaido could be a better version of a lion or something. Maybe we'll see a chimaera? Not sure if we saw that on Thriller Bark though.
Wasn't it said Kaido ate zoan-type devil fruit?
I just makes sense, if the strongest Zoan is in the hands of a Yonkou. It was just stated, that he's the strongest beast, so it makes sense. Kinda hard to beat a phoenix, if you ask me.
Pekoms is a lion-turtle dafuq creature I guess he was originally a humaniod lion, and has a turtle DF. That's different from a lion DF (which has gotta be epic). But the Awakened Zoans already wasted a lot of mythical creatures, which could've been suitable to Kaido's descriptions...