Then what species would MONsoon be?

I don't think even, The Greatest Soldier In The World!, BIIIIG BOSSSSS, can handle Miia's tail-based CQC.

Come to think of it, a new FOXHOUND made up of monster-girls does seem like a thing that could happen in this crossover universe. And who will help Snake defeat this new threat to nanomachines and metal gears? Who else but an actual snake? Miia, Waifu Snake.