>>2256218(Sorry, pic from Google search) go to the hair material and look in the "Opaque" tab on the screenshot, anything but 1 indicates transparency, if it's set at 1 it must be the textures which have alpha. There's a fix for the transparency issue so you don't need to get rid of the alpha, I can't boot up my pc but I think it was this:
https://github.com/ray-cast/ray-mmd/issues/24