Ha, I could've sworn there was a large One Piece Civ pack on the workshop somewhere already.
Can't say if it's any good though, since I've never tried it.
Excited for it. I was looking at Korean history the other day and thought "Why isn't there a Goguryeo civ yet?" I'm confused about the UA though. Will you remove the penalty against cities from mounted units? Because otherwise the bonus is just 17% (or 25% on the UU). By the way, I made a smoother version of the icon: