User blog comment:Eri aizawa/question???/@comment-4980287-20190711115110

Dabi (Toya, if he is) and his quirk is like Izuku Midoriya and his quirk as both quirks are too much for their bodies to handle which results in purple colored skin it could even happen to Shoto (even with his ice side) or Enji Todoroki since blue fire is stronger than red-orange fire.