Devil Fruits are these... well, fruits [ obviously ] that give people incredible powers. For example, my captain ate one that turned him into a rubberman. Our doctor ate one, too - he was a reindeer, but now he's incredibly smart and can talk and turn into something like a human. And our other crewmate Robin can sprout arms from any surface. The only downside is that you can't swim after you've eaten one - you just sink, like a hammer.