Based off the last couple of chapters? They're both pretty damn powerful. XD Fishmen are only really strong for the fact that they're physically superior to the average human. Which our humans are regardless. And they can breath underwater and all that. Jinbei is kind of an outlier in the fact that he was just a monster among Fishmen. So...if we chose a weaker race of fish, then maybe it'd be acceptable. A Mink seems to be massively powerful during certain phases of the month. Similar to Tony's rage mode, won't distinguish friend from foe but can do some serious damage. A Mink would likely wreck any early pirate crew we face.

I have a Devil's Fruit user that might be acceptable. He kind of comes with regular humans on the side of that from his backstory. Other than that, no one comes to mind right off the bat for me.