Well, Moetato is basically the one that is not that smart but definitely strong and protective. But he throws dirt whenever he starts an argument. Weepy is basically this shy guy that is always nervous and thinks he is under danger. And of course he cries a lot. Psycarrot is just Psycarrot. He is actually the smartest making all but he is stupid in some cases (like that stupid piece of paper with an eye drawn in the middle)(I simply just cannot think of how to place the eye on the human design), like he said that he can use the third eye but it is just there.
So these three have the biggest farm in inkwell isle 1, and they are basically the ‘monopoly’ of agriculture products there (and even some place beyond). Since Psycarrot is very good at persuading people to buy their products (usually in a higher-than-usual-price), people actually hate the root pack a lot. But they did not complain that much in the past because 1, their products are actually high quality and 2, Psycarrot is just good at doing his job. After the Agriculture Depression hits the USA before the Great Depression, they and many other farmers are the first to went broke. Psycarrot took the risk and got their belongings to try win at The Devil’s and, obviously, lost all their bets. So Psycarrot has to give out his soul, but instead of just writing his name, he wrote all three’s (I don’t think that Moetato and Weepy will be going there and gamble, they are not that type of people). Therefore they ended up becoming the first three to owe things to The Devil (and this is why they are the first bosses to be fight). (That piece of paper with the eye is so out of place tbh)