User blog comment:Kogath/Monster Hunter XX Discussion/@comment-26532315-20161027164501/@comment-2194133-20161027174026

It may only partially be related to this but in MH4U and MH3U I believe, Black Diablos has a weird blue-ish tint on her body on top of her regular black shell. I've never seen anything explaining this visual characteristic but perhaps Massacre King Diablos is a partially affected female who didn't quite reach Black Diablos status.