Board Thread:General Discussion/@comment-5205908-20161129194957/@comment-25375217-20161130023307

Blue isn't necessary the "original"; she just became the leader. It's possible that Blue had a predecessor and that she took over after she shadily murdered something happened to them.

I don't think the colors have anything to do with their hierarchy, though. Instead, color likely has to do with personality.

Looking up color meanings, we have: It fits pretty well, IMO (besides purple, but this could give us an idea of what the Black Fairy was like before her heart was darkened. I'd like to think that the Black Fairy was only a role she took up after her banishment.)
 * Blue: Intelligent, strong, calm.
 * Green: Hopeful, romantic, adventurous.
 * Pink: Compassionate, romantic, respectful.
 * Black: Secretive, powerful, intimidating.
 * Gold: Successful, elegant, sensitive.
 * Silver: Emotional, feminine, water-like.
 * And as an added bonus, Purple: Compassionate, understanding, supportive.