Help with cosplay for my Mother :) info will be below

okay me and my Mum are going to an anime convention. I have decided to go as C.c. from code geass but my Mum doesn't know who to go as yet. Do you have any good Mum characters for cosplay. We are thinking Marianne (also from code geass) but we are still not sure.the parent can be from any anime you know.thanks for your help :)