Sunbell
The number 4 of the Roger Pirates
You know it's a real shame that we don't have any seriously top tier fishmen.
I mean the giants have Loki, (and maybe buccaneers have WB because of height + chin), but Fishmen have nobody really strong.
Imagine, like....a Megalodon fishman, with some busted DF and a trident weapon.
Hell, imagine if
Kaido was a fishman. It'd fit the King of the Beasts aesthetic he has, and if he was some kind of ancient species like a Meg it'd explain his being ostracized.
And it'd explain why he doesn't just kill himself by drowning.
Plus it'd fit the whole carp-turning-into-dragon even more.