[@Martian] glad to see your interest! I haven't thought too much about races, but I suppose as long as it isn't OP or too out there for a medieval fantasy setting, it would make sense. E.g. a martian or some other original alien race would just be out of place, but an original race grounded in the sensibilities of a medieval fantasy world could work. Likewise, a giant would be too OP due to sheer physical strength (plus the logistics of a giant on a ship :P) but an elf would make sense.

Hopefully that gives you some insight; let me know if you have any other questions!