Holy crap. Someone that's actually noticed that Rem and Ram have certain features to distinguish them other than the color of their hair, such as different eye styles and bust sizes.
[Source](http://www.pixiv.net/member_illust.php?mode=medium&illust_id=58313425&from_sid=1837607041)
[Source](http://www.pixiv.net/member_illust.php?mode=medium&illust_id=58313425&from_sid=1837607041)