I've tried to dump everything from the firmware that I can, including the Mii data. It can be a bit tricky to know where to put everything for use in Citra though. All of my Miis show up in Mii Maker as well as in games. The only problem I run into is getting Mii Plaza to read the data correctly. It has all the data from my 3DS, and it shows all of the Miis that I have Street Passed with, but the app acts like it has never been run. It has me choose a Mii to represent me, but my Mii is not an option, then it gets stuck on naming the Mii, because of lack of a soft keyboard.