* Personal symbolism. Butterflies can represent a variety of things, including transformation, hope, and new beginnings. For Johnny, the butterflies on his mask may represent his personal journey of transformation and growth. He has spoken openly about his struggles with addiction and mental health, and the butterflies may symbolize his hope for a brighter future.
* Band symbolism. The butterflies on Johnny's mask may also have a symbolic meaning for the band Hollywood Undead. The band's music often deals with themes of death, darkness, and despair, but the butterflies may offer a glimmer of hope and light. They may also represent the band's evolution and growth over the years.
* Fashion statement. Butterflies are simply a cool and stylish design element, and Johnny may wear them on his mask simply because he thinks they look good.
Whatever the reason, the butterflies on Johnny's mask have become an iconic part of his image and have helped to make him one of the most recognizable members of Hollywood Undead.