The Blender BVH importer has a bug. If you try to import a BVH file which has Japanese bone names, it won't import into Blender, and you will get an error message ...

To install MMD Tools to Blender 2.78, copy the " mmd_tools " folder, contained inside the blender_mmd_tools folder, to \2.78\scripts\addons, then enable MMD Tools in Blender from the Add-ons tab of ...