They don't really get stronger based on how much your grind. Some of them do get stronger based on which month you are in.
will there be mage ranks and class ranking
will there also be a way to add the protagonist family to the story eventually and aslo will there be a preferred weapons system like if your preferred weapon is a sword it will do regular damage if you wield a sword if you wield any other weapon it will be reduced the protag can be the only exception