User blog comment:FairyRaven/Fairy Tail Chapter 319: The White Knight, Review and Commentary/@comment-16344653-20130215202012

Hisui IS the jade DS. I just know it because of her green hair :P. You guys might say "what the fuck does the hair have to do w/ anything?" but if you think about it: Kind of a long stretch, but that's my speculation :P
 * Fire DS- pink hair
 * Iron DS- black hair
 * Sky DS- blue hair
 * Lightning DS- blond
 * Poison DS- red hair
 * Shadow DS- black hair
 * White DS- blond but paler than Laxus' hair