Do you guys need a "Tank"? How about a Merman Oracle of the Waves? My idea was spawned from the Lame Mystery being that one leg looks like a fin. He can power hop, and like a cartoon, he can fluid travel so he can actually hop on water be it only 10 feet as a move speed, but he can carry an unlimited amount of weight. He could be the Ship's Chief Medical Officer (2 Cure Lt. Wounds Spells),use Mending to repair the sails and purify the food and water as a chef.
Option #2 was "Anchorman" (I'm Ron Burghandy?) a Barbarian Raging Swimmer a mix between Mr. T and Michael Phelps minus the medals and medicinal drug use. I wanted a spiked chain worn around his neck and a lot of "I pity the fool..." comments.