User blog comment:ChishioKunrin/Dust Speculation and Whatnot/@comment-25555436-20150111000349/@comment-73.42.187.52-20150111005607

^I still think that might be what Yang's hair is tbh, maybe Taiyang ate fire dust(or however you infuse it) and that is how he breathes fire or something, and Yang is so saturated with the stuff her hair naturally burns.