When I installed it on both my Samsung Phone and Retroid Pocket, it didn't make default mii files for some reason, causing none of the body assets to load and preventing me from properly making Miis.
On Retroid, I was able to make only one mii at a time, but by saving, editing it, and then re-saving it, the mii showed up and I was able to copy it from the Android/data folder and create a new default male mii, and then repeat the process for the default Female Mii. Unfortunately, this is impossible on any device that runs modern android, as it is no longer possible to access anything in the Android/data folder, at least on device. Supposedly you can access them if you browse your phone's files on a computer, but I'm unable to check right now.