I just came across a pretty good addition to the game, that being tattoos. (Thanks to @MaleficMojo).
He said founder/pioneer tattoos, which is a good/bad idea. But anyway.
I could see tattoos being a thing with progression, say when you become a higher rank pirate, E.G. Legendary Captain ect.. You can choose to get tattoos to rep your rank.
Or for defeating the Kraken, a tattoo to say you have done that. Or just little-hidden things that most people come across and you basically get to show off.
Either way, I think it's a good idea for them to add tattoos, anyone else?