User blog comment:WarrenWitch/Sembura :D/@comment-15108745-20131025005258/@comment-5217560-20131025005923

I could see Pyrokinesis being her Semblance. Maybe in a more finite/limited form though.

Well they have said that Weiss is a complex character, and her color is white. So in my head, White being a color that encompasses all colors would explain her multi-colotedness and the glyphs being a reprentation of how...diverse Weiss is as a character I guess. Or something of that nature.

I think you're dead on with Ruby. If I may add, it also may have to do with how energetic she is and how quick she is to take action.

Your guess is as good as mine on Pyrrha. I mean...what aspect of her does her Semblance truly represent? Eh.