- A possible beta version of Millie appeared in Miiverse promotions. This beta version features lighter brown hair, curved eyebrows, blue eyes with less eyelashes, and a smaller nose and mouth. The favourite color is also pink, contrast to white.
- In Wii Party U, she is a Standard Mii.
- A Mii used from Miitomo promotions named Erica is vaguely simmilar to Millie. This Mii was given a official name in the introduction to the Miifoto log, however the Mii has a different hairstyle and hair color, but it does have blush, just like Millie. However, Erica is shown in a wig in the Miifoto log introduction.