Ok so hear me out, you have a simple homebrew class system based on 5e(maybe pathfinder) have very rare devil fruits that count as subclasses, like Ur a swordsman who eats the chopchop fruit: a chopchop swordsman then you have characters be made based on what roles you need in the crew

Okokokok so hear me out, a separate two system character creator: combat/utility skills; and a flavour/world skillcheck system. Like you pick and choose beetween shipwright cook navigator etc etc that lets you add flavour to your character and interacts with event checks at sea and in town and so on