an extra featrue apart from fighting style to choose when starting the game
Navigator:you can use log pose to guide you to the place where world event is happening
Cook:cook quicker and the food you cook relieve more hunger
Doctor:heal targets(ye,change doctor into here,how can a doctor fight)
Shipwright:you can craft sturdy boats(or only you can enhance boats with kairoseiki?)
Helmsmen:you can paddle faster
Lookouts:make mobs you are looking at glowing with your telescope to help your crewmates find potential powerful enemies
Craftsman:make you can craft mmnm weapons with smithing table(especially meitos)
Scientist:cost sanity to make you can regenerate df/create pasifista/clone mobs,only if you eat the brain fruit can it make you have higher sanity to invent all above and even create seraphim