Fluttershy, Rainbow Dash, Pinkie Pie, Applejack, Rarity, and Twilight Sparkle. Six ponies who have taken on huge responsibilities as the bearers of the Elements. But it seems to me like, even though we know these ponies pretty well, we haven't really been offered many glimpses into their personal thoughts. This is what this story is for.

Six chapters, six letters.
Twilight.
Apple Jack.
Rainbow Dash.
Rarity.
Pinkie Pie.
FlutterShy.
Six (hopefully good) glimpses into the minds and hearts of six ponies