My little head-canon: metamorphoses of ponies' mind and body · 6:47pm May 18th, 2014
You all remember Nightmare Moon transformation (S04E01-02), don't you? Also, I think you all remember how Fluttershy changed when her mind was affected by Twilight's spell (S04E07), and how Pinkie's hair changed when she become crazy (S01E25), and how mane6's pelts became dull when their mind was discorded, and even Twilight's pelt, when she gave up (S02E01-02)...