By all means, I think it's a fine and plausible idea and you should go ahead with it. I haven't seen the idea yet so I fully encourage it; even so, if you wanted to be detailed with it, you'll have to make a lot of assumptions about Doma's system. We do know it's based on Japan, yes, but on which period of Japan? Anywhere from Heian period at the earliest and Edo period at the latest, which is a huge range with the potential to have notably different social structures.
Is Doma a feudal society? Was there an emperor, shogun, or daimyo that ruled Doma to answer to? Was there more than one daimyo? Were wealthy merchant classes considered as nobility, or did only hereditary families hold court influence? Was there a court at all? Did the nobles own land? If so, where? In the Kamakura period of Japan, Kuge where divided into six groups. Does Doma follow the same system? Which group did the family fall under? Was there tension between the samurai class and the nobility?
I'll fully admit that none of these details matter (Really, all you have to say is "<x> is descended from Doman aristocracy" and any issues resolve themselves) in any significant capacity so you really can just ignore them, but detail is always nice to have.
Is Doma a feudal society? Was there an emperor, shogun, or daimyo that ruled Doma to answer to? Was there more than one daimyo? Were wealthy merchant classes considered as nobility, or did only hereditary families hold court influence? Was there a court at all? Did the nobles own land? If so, where? In the Kamakura period of Japan, Kuge where divided into six groups. Does Doma follow the same system? Which group did the family fall under? Was there tension between the samurai class and the nobility?
I'll fully admit that none of these details matter (Really, all you have to say is "<x> is descended from Doman aristocracy" and any issues resolve themselves) in any significant capacity so you really can just ignore them, but detail is always nice to have.
