Hmmm, interesting question / idea. I'll say that I've just become very used to my anthropomorphic companions, I don't know how i would feel sharing space with another human crewmwmber, wouldn't this just confuse us which are crew and which are friends?
I'm honestly not a furry,yea big shock,i'm a brony yet i'm not a furry. yet i like this game,and though i enjoy my animal and undead companions,would the world be destroyed if we just had 1 human companion...that was alive.
What kind of human would you have in mind? A pirate kid , like us, or an adult? One of each class and of course, still living, lol. An old friend from our childhood or a former crewmember of Mom and Dad?
In theory we already do have some human companions. Although they are sadly undead. All Zombie and skeleton companions (except skeletons of actual animals like the tribal hoard witchdoctor and the skeleton monkies)