I am just recently starting to experiment with MMD and PMX right now. Marisa Kirisame is my first project. I added chest physics, changed up the original body texture quite a bit, added a version of Marisa with fox ears and tails and even tried to implement sliders for the southern nether regions (failed pretty badly though). I have both normal and fox Marisa's with the added and unadded nether regions in the file. I don't really care if anyone uses this model for whatever, in fact, I think it would be cool to see it around anyway. Well, here is a picture of her in the default pose without any effects.
I made some fairly large changes to my previous edit for those who may be interested. I combined all forms of Marisa now so there is only only pmx. Also, with the help of J&J's Reimu edit, I gave my Marisa a slider for her nether regions.