This is something I really wanted to do. Since they are both cowgirls, or at least I think, it would be such a thrill to put them together. It also gives me an excuse to put Millie is a maid outfit. It was fun drawing Mia's hair. Indeed it was. Anyways, hopefully Eika doesn't mind that I drew two of his original characters.
I just had a image of Millie helping Mia out on a job. I think they would work well together I think so I couldn't resist.