I would like that each time I start a new game that the custom girls would be stats / traits would vary somewhat.
My idea is that when the girl is loaded from the .girls file at game start a random profile would chosen and used to modify the base girls data. This would not require any changes to the .girls file structure.
I would have a profile file (.pgirls

) that contains a number of profiles that are structured similarly to .rgirls
May be you could also limit to only using a profile from a file of the same name as the .girls file it that .pgirls file exists.