User blog comment:FairyRaven/Fairy Tail Chapter 428: When We Take Different Paths, Review and Commentary/@comment-76.121.234.236-20150415065247/@comment-25111584-20150417081449

Only Slayers having different anatomy is not a given. Anybody with the correct Magic could have an anatomical structure which differs from that of normal humans. Juvia has stated at least once that her body is made of water, not something which has to be activated. Considering how she is ... pretty different from normal humans anyway due to her Rain Curse, it isn't that unreasonable either. If this is the case, getting sick due to rain sounds ridiculous.