Most of the new, (and even old), RPG systems have skills that allow characters to do certain things, such as craft items or pick locks. So what ever system your using, most of the skills will fit on Martapa just fine. Here are a list of skills I would recommend definitely having for Martapa:
Use Magic Device
I would also add in Religion, History (Martapa), History (Tridon), History (Ariella), Nobility (Tridon) and Nobility (Ariella). Your RPG system may have Knowledge skills with similar abilities, but these would be more world specific.