User blog comment:FairyRaven/Fairy Tail Chapter 325: Unity, Review and Commentary/@comment-49.176.34.54-20130330054337/@comment-49.176.8.167-20130330092955

Well the name Hisui is a big hint(if it is...) the dragon is a Hisui dragon... and hence her name is also Hisui... and then hence the hair colour.... so it's kind of reasonable for people to think shes one of the dragon slayer... which the King might be one too(or even the original... or...just coincidence...)