>>10668115So, the size denominations with megami device are new, and again, it's only a thing with Susanowo and Amaterasu at the moment. There will be an S type eventually, but at the moment everything else is an M type.
Don't worry about compatibility for md at the moment unless you are planning on getting Susanowo and her sister. The acronyms are just denoting in universe line subdivision, it's just flavor text.
