Imaculata
Hero
One thing I outlawed in my pirate campaign, now that I think about it, is any races that can naturally breath underwater. I want the sea to remain an interesting obstacle for all players, that is not simply negated by being able to naturally breath underwater. Using spells, potions, or shapeshifting abilities however, is just fine. Just as long as the players need to make some effort to deal with water as an obstacle. I also outlawed any permanent flying abilities or races. I want the players to travel the oceans, not fly over them. Using a fly spell, or shapeshifting into a bird, is fine though. Just as long as the focus of the campaign remains on sailing and naval battles.