According to http://www.pixiv.net/member_illust.php?mode=medium&illust_id=26910033 the red-haired one is a girl. The purple-haired one... is a brooch (and a deer). So I'm not really certain if any gender tag is appropriate for that one.

Thanks a lot for clearing that up--couldn't make heads or tails of the two (sexes, that is).