'We all know Twilight Sparkle: a lavender unicorn who is a student of Celestia. But Twilight was never a pony. In fact, she kept her true identity hidden until her 'brother's wedding day.
Twilight Sparkle: a name often associated with magic, friendship, harmony, and most recently, ascendant princess of Equestria. Nopony, not even herself, could have thought that she would be a changeling.